因式分解,

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因式分解,因式分解, 因式分解,原式=(x+y)(x-y)-(x+y)^2=(x+y)(x-y-x-y)=-2y(x+y)x²-y²-(x+y)²=(x+y)(

因式分解,
因式分解,
 

因式分解,
原式=(x+y)(x-y)-(x+y)^2
=(x+y)(x-y-x-y)
=-2y(x+y)

x²-y²-(x+y)²
=(x+y)(x-y)-(x+y)²
=(x+y)[(x-y)-(x+y)]
=-2y(x+y)

原式=x²-y²-(x²+2xy+y²)=2xy-2y² 赞一个呗

以上分解的都正确