问题标题:
【(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)】
问题描述:
(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)
孙淑琴回答:
(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)
=4x²-4xy+y²-4x²+4y²-x²+xy-y+x
=-x²-4xy+5y²+xy-y+x
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