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例题已知方程组{a-2b-3c=4,5a+6b+7c=8,则9a-2b-5c=___. 分析:这个方程组有三个未知数,两个方程,一般情况下,不易求出每个未知数具体的解,但我们可以从不同角度来分析,现介绍以下几种解法.……
多角度思考全方位解题
【摘 要】
：
例题已知方程组{a-2b-3c=4,5a+6b+7c=8,则9a-2b-5c=___. 分析:这个方程组有三个未知数,两个方程,一般情况下,不易求出每个未知数具体的解,但我们可以从不同角度来分析,现
【出 处】
：
中学生数理化(七年级数学)(华师大版)
【发表日期】
：
2007年1期
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