6xy²-9x²-y³
问题描述:
6xy²-9x²-y³
答
6xy²-9x²y-y³
=-y(y²-6x+9x²)
=-y(y-3x)²
6xy²-9x²-y³
6xy²-9x²y-y³
=-y(y²-6x+9x²)
=-y(y-3x)²