题目内容
把(x-y)看成一个整体合并同类项:5(x-y)2+2(x-y)-3(x-y)2+
(x-y)-3.5.
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原式=5(x-y)2-3(x-y)2+2(x-y)+
(x-y)-3.5
=(5-3)(x-y)2+(2+
)(x-y)-3.5
=2(x-y)2+
(x-y)-3.5.
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=(5-3)(x-y)2+(2+
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=2(x-y)2+
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