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【329731】5.2 求解二元一次方程组(加减法) 基础练习

时间:2025-02-03 19:06:31 作者: 字数:733字


 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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(2

一、选择题

1.解方程组 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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> ,错误的解法是( )

A.先将①变形为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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.将 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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> ,消去 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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> D.将 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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> ,消去 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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>

二、填空题

2.已知方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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>

3.二元一次方程组 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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> 的解和二元一次方程 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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> 的解相同,则 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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.用加减消元法解下列方程

1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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

1A

24 ,-2

32

4.(1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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/52/" title="减法" class="c1" target="_blank">减法</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>