当前位置:首页 > 九年级 > 数学试卷

【323454】2023九年级数学上册 第二章 一元二次方程1 认识一元二次方程(2)练习(新版)北师

时间:2025-01-16 18:35:54 作者: 字数:6529字
简介:


2.1 认识一元二次方程(2


1题. 若方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是一元二次方程,则 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的取值范围是



2题. 下列方程中,不是整式方程的是(

A. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> B. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

C. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> D. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>



3题. 下列各方程中一定是关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的一元二次方程的是(

A. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> B. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

C. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> D. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>



4题. 若方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的一元二次方程,则 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的取值范围是(

A. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> B. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> C. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> D. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 为任意实数



5题. 把下列方程整理成一般形式,然后写出其二次项系数,一次项系数及常数项.

1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>



6题. 设 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 都是一元二次方程,求 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的值.



7题. 关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是一元二次方程,求 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的值.



8题. 方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 化为一般形式后,二次项系数是 ,一次项系数是 ,常数项是



9题. 若 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是一元二次方程,则不等式 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的解集是

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>


10题. 下列方程中,不是整式方程的是(

A. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> B. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

C. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> D. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>



11 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 题. 若方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的一元二次方程,则 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的取值范围是(

A. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> B. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> C. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> D. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 为任意实数



12题. 求关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的一元二次方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的二次项系数、一次项系数及常数项.



13题. 下列各方程中属于一元二次方程的是(   )

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>    (2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>     (3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

4 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>   (5 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>   (6 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

A.(1)(2)(3).      B.(2)(3)(4).

C.(1)(2)(6).      D.(1)(2).



14题. 把下列方程先化成一元二次方程的一般形式,再写出它的二次项系数、一次项系数和常数项:

1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>



15题. 不解方程,估计方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的根的大小(精确到01


16题. 下列方程中属于一元二次方程的是(   )

A. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> .     B. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

C. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> .       D. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>



17题. 关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的一元二次方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 中,二次项系数、一次项系数、常数项分别是(   )

A.1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> .     B.1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

C.1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> .        D.1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>



18题. 在下列方程中一定是关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的一元二次方程的是(   )

A. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> .       B. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

C. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> .    D. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>



19题. 填表

一元二次方程

一般形 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

二次项系数

一次项系数

常数项

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>





 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>





 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>





 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>








20题. 若方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是一元二次方程,则必须满足条件      

若此方程是一元一次方程,则必须满足条件       



21题. 当 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>      时,方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的一元二次方程.



22题. 关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的一元二次方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,化成一般形式是    .二次项系数是       ,一次项系数是     ,常数项是


23题. 解方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 时,设 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,则原方程化成关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的整式方 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 程是     



24题. 已知 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 均为有理数,判定关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是不是一元二次方程?如果是,请写出二次项系数、一次项系数及常数项.如果不是,请说明理由.



25题.  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 为何值时,关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是一元二次方程?写出这个一元二次方程的一般形式.



26 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 题. 下列各式哪个不是二次三项式(    )

A. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 为实数

B. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

C. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>



27题. 将方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 化成一般形式是     



28题. 用一块长宽分别为8cm6cm的矩形薄铁片,在四个角处裁去四个相同的小正方形,再折叠成一个无盖且底面积为15cm <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的长方体盒子,据上述题意,可得方程:        



29题. 若 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的一个解,你能求出 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的值吗?



30题.  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>      时,关于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 的方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 是一元二次方程.



31题. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 种洗 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 衣机的包装箱外形是长方体,其高为12米,体积

12立方米,底面是正方形,则该包装箱的底面边长为   米.




 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>


1.答案: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

2.答案:C

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 3.答案:A

4.答案:(1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,二次项系数为: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,一次项系数 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,常数项为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,二次项系数为2,一次项系数为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,常数项为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

5.答案:C

6.答案: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

7.答案: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

8.答案:1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>1

9.答案: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

10.答案:C

11.答案:C

12.答案:解:将方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 化为一般式:

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 已知该方程是一元二次方程,所以 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

此方程的二次项系数为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,一次项系数为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,常数项为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

13.答案:D

14.答案:

题号

一般形式

二次项系数

一次项系数

常数项

1

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

5

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

4

2

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

4

0

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

3

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

1

16

0

15.答案:解:分别取 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 时,

有: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> .于是,方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 必有一根在 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 之间.

分别取 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 时,有: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

因此,方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 必有一根在4243之间.


16.答案:C

17.答案:B

18.答案:C

19.答案:

一元二次方程

二次项系数

一次项系数

常数项

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

2

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

5

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

0

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

1

0

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

1

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

0

20答案: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

21.答案: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

22.答案:一般形式是 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ;二次项系数是1,一次项系数是 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,常数项是 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

23.答案 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

24.答案:是一元二次方程,二次项系数为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,一次项系数为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,常数项为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

25.答案: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,一般形式 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

26.答案:D

27.答案: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

28.答案: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

29.答案:1

30.答案: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

31.答案:0,将 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> 代入 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,得 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> ,从而 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/53/" title="认识" class="c1" target="_blank">认识</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a>

www.ishijuan.cn 爱试卷为中小学老师学生提供免费的试卷下载关注”试卷家“微信公众号免费下载试卷