-y+x²y=多少?

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-y+x²y=多少?-y+x²y=多少?-y+x²y=多少?-y+x²y=x²y-y=y(x²-1)=y(x+1)(x-1)

-y+x²y=多少?
-y+x²y=多少?

-y+x²y=多少?
-y+x²y
=x²y-y
=y(x²-1)
=y(x+1)(x-1)