已知关于x y的方程组{2x+3y=2m;3x+2y=4m-1的解x-y
人气：239 ℃ 时间：2019-10-17 01:32:19
解答
解
3x+2y-2x-3y=4m-1-2m
所以x-y=2m-1
又x-y
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