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[(x²-y²)+(x²+y²)][(x²-y²)-(x&#

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[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
[(x²-y²)+(x²+y²)][(x²-y²)-(x&#
[(x²-y²)+(x²+y²)][(x²-y²)-(x²+y²)]
=(x²-y²+x²+y²)(x²-y²-x²-y²)
=(2x²)(-2y²)
=-4x²y²
因式分解:x²(x-y)+(y-x) 2.(x+y)²(x-y)²-(x-y)(x+y）(x²+y²) (2x-y)²-4(x-y)(x+2y) (x-y)³+9(x-y)-6(x-y)² (x-y)³(x-y)²(y-x)等于多少 化简：（2x-y)²-4(x-y)(x+y) x²-y²+x+y 1、y-x/x²-y² 约分：y-x/x²-y² (x+y)²+x+y-6因式分解 (x-y)²-(x-y)因式分解 因式分解 a²（y-x)+(x-y)