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(x+y)^4(x-y)^2-(x+y)^2(y-x)^4\\(a-1)^2n-1+2(1-a)^2n+(a-1)^2n+1\\4(x+y)^2+5-20(x+y-1)因式分解,帮忙
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(x+y)^4(x-y)^2-(x+y)^2(y-x)^4\\(a-1)^2n-1+2(1-a)^2n+(a-1)^2n+1\\4(x+y)^2+5-20(x+y-1)因式分解,帮忙
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(x+y)^4(x-y)^2-(x+y)^2(y-x)^4＝(x+y)^4(x-y)^2-(x+y)^2(x-y)^4=(x+y)^2(x-y)^2[(x+y)^2-(x-y)^2]=4xy(x+y)^2(x-y)^2(a-1)^2n-1+2(1-a)^2n+(a-1)^2n+1＝(a-1)^2n-1+2(a-1)^2n+(a-1)^2n+1=(a-1)^2n-1[1+2(a-1)+(a-1)...
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