化简(x-2y)平方-(2x-y)(-2x-y)+(x-5y)(x+2y)

问题描述:

化简(x-2y)平方-(2x-y)(-2x-y)+(x-5y)(x+2y)
1个回答 分类:数学 2014-12-15

问题解答:

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(x-2y)²-(2x-y)(-2x-y)+(x-5y)(x+2y)
=x²+4y²-4xy-y²+4x²+2xy-5xy-10y²=6x²-7y²-7xy
 
 
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