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【323457】2023九年级数学上册 第二章 一元二次方程4 用因式分解法求解一元二次方程练习(新版

时间:2025-01-16 18:36:02 作者: 字数:2891字
简介:


第二章 一元二次方程

2.4  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> 因式分解法求解一元二次方程

一、选择题

1. 下列多项式不能在实数范围内分解的是

A.  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> B. <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

C.  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> D.  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> 2. 两个连续正整数的和的平方比它们的平方和大112,则这两个正整数是

A. 56 B. 78 C. 89 D. 67

3. 某印刷厂一月印50万册,二,三月共印132万册,问二、三月平均每月增长的百 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> 分数是

A. 20% B.  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> C. 10% D. 15%

4. 某工厂计划在长24米,宽20米的空地中间划出一块32平方米的长方形建一住房,并 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> 且四周剩余地一样宽,那么这宽度应是

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> A. 14 B. 8

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> C. 14米或8 D. 以上都不对

 

二、填空题

5. 因式分解

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

6. 一个两位数等于它个位数的平方,且个位数比十位数大3,则这个两位数是_________

7. 某药品经两次降价,从原来每箱60 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> 元降为每箱48.6元,平均每次降价率为_________

8. 有两个数不等,和17,积比小点数的平方大30,用方程求这两数,设_________,根据题意,列方程得_________

9. 一矩形面积132cm2,周长46cm,则矩形长是______ <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> ___,宽是_________

10. 连续两个正奇数的平方和等于202,这两个奇数中较小的是_________

 

三、解答题:

11. 已知二次三项式 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> 是一个完全平方式,求m的值。

12. 面积为150m2的矩形鸡场,长边靠墙(墙长18m),另三边用竹篱笆围成,若篱笆长 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> 35m,求鸡场的长和宽。

13. 一批上衣原来每件500元,第一次降价,销售甚慢,第二次大幅降价的百分率是第一次的2倍,结果以每件240元价格迅速售出,求每次降价的百分率。

14. 在长为a的线段AB上有一点C,且ACABBC的比例中项,求线 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>AC的长。


【试题答案】

一、选择题

1. C 2. B 3. A 4. B

 

二、填空题

5. ① <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

6. 2536

7. 10%

8. 小数为x <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

9. 12cm11cm

10. 9

 

三、解答题:

1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> 1. 解: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

原二次三项式是完全平方式

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

12. 解:设篱笆长为x cm,根据题意,

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

解得: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> 检验: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> ,鸡场长超过墙长是不可能的, <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> 舍去。

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

答:鸡场长为15m,宽为10m

13. 设第一次降价的百分率为x,则第二次降价的百分率为2x

依题意  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> (不合题意,舍去)

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

答:第一次降价20%,第二次降价40%

14. 解:由题意, <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> (舍负)

 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a>

答:线段 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> AC长为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</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/845/" title="因式分解" class="c1" target="_blank">因式分解</a> <a href="/tags/897/" title="二次方程" class="c1" target="_blank">二次方程</a> <a href="/tags/1603/" title="因式" class="c1" target="_blank">因式</a> a

 


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