分解因式：6xy²-9x²y-y³+y
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分解因式：6xy²-9x²y-y³+y分解因式：6xy²-9x²y-y³+y分解因式：6xy²-9x²y-y³
分解因式：6xy²-9x²y-y³+y
分解因式：6xy²-9x²y-y³+y
分解因式：6xy²-9x²y-y³+y
6xy²-9x²y-y³+y
=-y(9x²-6x+y²-1)
=-y[(3x-y)²-1]
=-y(3x-y+1)(3x-y-1)
6xy²-9x²y-y³+y
=-y(9x²-6xy+y²-1)
=-y[(3x-y)²-1]
=-y(3x-y+1)(3x-y-1)
6xy²-9x²y-y³+y
=-y(9x²-6xy+y²)+y
=-y(3x-y)²+y
=y[1-(3x-y)²]
=y(1+3x-y)(1-3x+y)