(x-y)^4-2(x-y)^2+1,分解因式,
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(x-y)^4-2(x-y)^2+1,分解因式,
(x-y)^4-2(x-y)^2+1
={(x-y)^2-1}^2
={(x-y+1)(x-y-)}^2
=(x-y+1)^2 (x-y-)^2
(x-y)^4-2(x-y)^2+1,分解因式,
(x-y)^4-2(x-y)^2+1
={(x-y)^2-1}^2
={(x-y+1)(x-y-)}^2
=(x-y+1)^2 (x-y-)^2