1.[1/2x-y)^2+(1/2x+y)^2](1/2x^2-2y^2) 2.(2x^3-5x-4)(3x^2-7x+

问题描述:

1.[1/2x-y)^2+(1/2x+y)^2](1/2x^2-2y^2) 2.(2x^3-5x-4)(3x^2-7x+8) 简便运算
1个回答 分类:数学 2014-10-27

问题解答:

我来补答
原式=(1/4x²-xy+y²+1/4x²+xy+y²)(1/2x²-2y²)
=(1/2x²+2y²)(1/2x²-2y²)
=1/4x^4-4y^4
原式=6x^5-14x^4+16x³-15x³+35x²-40x-12x²+28x-32
=6x^5-14x^4+x³+23x²-12x-32
 
 
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