问题描述:
解了给100分.
已知|x+1|与|2x+y|互为相反数,求多项式3(x-y)-5(x-y)²-3(x+y)+(y-x)²-4(x+y)²+3(y-x)的值
已知|x+1|与|2x+y|互为相反数,求多项式3(x-y)-5(x-y)²-3(x+y)+(y-x)²-4(x+y)²+3(y-x)的值
问题解答:
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