(-1/3n^3)-(-1/3(n-1)^3)等于?

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(-1/3n^3)-(-1/3(n-1)^3)等于?(-1/3n^3)-(-1/3(n-1)^3)等于?(-1/3n^3)-(-1/3(n-1)^3)等于?原式=-1/3[n^3-(n-1)^3]=-

(-1/3n^3)-(-1/3(n-1)^3)等于?
(-1/3n^3)-(-1/3(n-1)^3)等于?

(-1/3n^3)-(-1/3(n-1)^3)等于?
原式=-1/3[n^3-(n-1)^3]
=-1/3[n-(n-1)][n^2+n(n-1)+(n-1)^2]
=-1/3(3n^2-n+1)
=-n^2+1/3n-1/3.