当前位置:首页 > 八年级 > 数学试卷

【329730】5.2 求解二元一次方程组(代入法) 基础练习

时间:2025-02-03 19:06:23 作者: 字数:774字


 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>

5.2 求解二元一次方程组(1

一、选择题

1.用代入法解方程组 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> 正确的解法是( )

A.先将①变形为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> ,再代入② B.先将①变形为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> ,再代入②

C.先将②变形为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> ,再代入① D.先将②变形为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> ,再代入①

二、填空题

2.将方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> 中的 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> 用含 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> 的代数式表示为

3.已知方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> 的两个解是 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a> ,则 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>

三、解答题

4.用代入消元法解下列方程

1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>




3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>4 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>




5 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>6 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>




参考答案

1B

2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>

34 , 2

4.(1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>4 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>5 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>6 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/197/" title="基础" class="c1" target="_blank">基础</a> <a href="/tags/380/" title="方程" class="c1" target="_blank">方程</a>