Thanks!超急,十万火急的急!(3)共有5题,在此分5题求解答!因式分解:1+2xy-x^2-y^2

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Thanks!超急,十万火急的急!(3)共有5题,在此分5题求解答!因式分解:1+2xy-x^2-y^2

Thanks!超急,十万火急的急!(3)共有5题,在此分5题求解答!因式分解:1+2xy-x^2-y^2
Thanks!超急,十万火急的急!(3)
共有5题,在此分5题求解答!
因式分解:1+2xy-x^2-y^2

Thanks!超急,十万火急的急!(3)共有5题,在此分5题求解答!因式分解:1+2xy-x^2-y^2
=1-(x^2-2xy+y^2)
=1-(x-y)^2
=(1+x-y)(1-x+y)