xy-x-y+1 用分组分解法因式分解

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xy-x-y+1用分组分解法因式分解xy-x-y+1用分组分解法因式分解xy-x-y+1用分组分解法因式分解xy-x-y+1=x(y-1)-(y-1)=(y-1)(x-1)xy-x-y+1=(xy-y

xy-x-y+1 用分组分解法因式分解
xy-x-y+1 用分组分解法因式分解

xy-x-y+1 用分组分解法因式分解
xy-x-y+1
=x(y-1)-(y-1)
=(y-1)(x-1)

xy-x-y+1
=(xy-y)-(x-1)
=y(x-1)-(x-1)
=(y-1)(x-1)