xy-x+y-1如何因式分解?

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xy-x+y-1如何因式分解?xy-x+y-1如何因式分解?xy-x+y-1如何因式分解?xy-x+y-1=x(y-1)+y-1=(x+1)(y-1)

xy-x+y-1如何因式分解?
xy-x+y-1如何因式分解?

xy-x+y-1如何因式分解?
xy-x+y-1=x(y-1)+y-1
=(x+1)(y-1)