作业帮七年级数学,怎做?有好评
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七年级数学,怎做?有好评
七年级数学,怎做?有好评
七年级数学,怎做?有好评
(x^2)(y^2-1)+(1-y^2)
=(x^2)(y^2-1)-(y^2-1)
=(y^2-1)(x^2-1)
=(y+1)(y-1)(x+1)(x-1)
(x^2)(y^2-1)+(1-y^2)
=(x^2)(y^2-1)-(y^2-1)
=(y^2-1)(x^2-1)
=(y+1)(y-1)(x+1)(x-1)
对不起，本来看错了