x方y方-x方-y方+1因式分解
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x方y方-x方-y方+1因式分解x方y方-x方-y方+1因式分解x方y方-x方-y方+1因式分解x方y方-x方-y方+1=x²(y²-1)-(y²-1)=(y²
x方y方-x方-y方+1因式分解
x方y方-x方-y方+1因式分解
x方y方-x方-y方+1因式分解
x方y方-x方-y方+1
=x²(y²-1)-(y²-1)
=(y²-1)(x²-1)
=(x+1)(x-1)(y+1)(y-1)
x^2y^2-x^2-y^2+1
=x^2(y^2-1)-(y^2-1)
=(x^2-1)(y^2-1)
=(x+1)(x-1)(y+1)(y-1)
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