解方程组(ax+by=2,cx-7y=8)时,甲得出正确结果为(x=3,y=_2),乙因为吧c写错了,解得(x=_2,y=2)试求abc的值.
人气：107 ℃ 时间：2019-08-21 19:25:20
解答
因甲正确
则易得 c=-2
又
3a-2b=2
-2a+2b=2
所以
a＝4
b＝5
c＝-2
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