(x²+x+1)²-1分解公因式(x-y)²/4-(x+y)²/4分解公因式

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(x²+x+1)²-1分解公因式(x-y)²/4-(x+y)²/4分解公因式(x²+x+1)²-1分解公因式(x-y)²/4-(x

(x²+x+1)²-1分解公因式(x-y)²/4-(x+y)²/4分解公因式
(x²+x+1)²-1分解公因式
(x-y)²/4-(x+y)²/4分解公因式

=1/4（x-y+x+y)(x-y-x-y)=1/4*2x*(-2y)=-xy