(x+y)²+9(x-y)²-6(x²-y²)

(x+y)²+9(x-y)²-6(x²-y²)
(x+y)²+9(x-y)²-6(x²-y²)

(x+y)²+9(x-y)²-6(x²-y²)
您好：

(x+y)²+9(x-y)²-6(x²-y²)
=（x+y）²-6（x+y）（x-y）+9（x-y）²
=[(x+y)+3(x-y)][(x+y)-3(x-y)]
=(4x-2y)(4y-2x)
=4(2x-y)(2y-x)


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