Thanks!超急,十万火急的急!(5)共有5题,在此分5题求解答!因式分解:(x+y)(x-y)+4(y-1)

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Thanks!超急,十万火急的急!(5)共有5题,在此分5题求解答!因式分解:(x+y)(x-y)+4(y-1)
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Thanks!超急,十万火急的急!(5)共有5题,在此分5题求解答!因式分解:(x+y)(x-y)+4(y-1)
Thanks!超急,十万火急的急!(5)
共有5题,在此分5题求解答!
因式分解:(x+y)(x-y)+4(y-1)

Thanks!超急,十万火急的急!(5)共有5题,在此分5题求解答!因式分解:(x+y)(x-y)+4(y-1)
(x+y)(x-y)+4(y-1)
=x^2-y^2+4y-4
=x^2-(y^2-4y+4)
=x^2-(y-2)^2
=(x+y-2)(x-y+2)