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先化简再求值 (x+y)^2(x-y)^2-(x^2+y^2)^2 其中x=2 y=-1/2
人气:147 ℃ 时间:2020-03-29 22:12:55
解答
解(x+y)²(x-y)²-(x²+y²)²=[(x+y)(x-y)]²-(x²+y²)²=(x²-y²)²-(x²+y²)²=[(x²-y²)-(x²+y²][(x²-y²)+(x...
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