-m的3次方+2m的2次方-m-m的3次方+2m的2次方-m

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-m的3次方+2m的2次方-m-m的3次方+2m的2次方-m-m的3次方+2m的2次方-m-m的3次方+2m的2次方-m-m的3次方+2m的2次方-m-m的3次方+2m的2次方-m-m的3次方+2m的

-m的3次方+2m的2次方-m-m的3次方+2m的2次方-m
-m的3次方+2m的2次方-m-m的3次方+2m的2次方-m

-m的3次方+2m的2次方-m-m的3次方+2m的2次方-m
-m的3次方+2m的2次方-m
=-m(m^2-2m+1)
=-m(m-1)^2