分解因式：-x的三次方y+2x²y-xy
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分解因式：-x的三次方y+2x²y-xy分解因式：-x的三次方y+2x²y-xy分解因式：-x的三次方y+2x²y-xy-x的三次方y+2x²y-xy=-xy(
分解因式：-x的三次方y+2x²y-xy
分解因式：-x的三次方y+2x²y-xy
分解因式：-x的三次方y+2x²y-xy
-x的三次方y+2x²y-xy=-xy(x^2-2x+1)=-xy(x-1)^2
-x³y+2x²y-xy
=-xy(x²-2x+1)
=-xy(x-1)²