若M=1/3x(x+1)(x+2) N=1/3x(x-1)(x+1),则M-N等于() .

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若M=1/3x(x+1)(x+2) N=1/3x(x-1)(x+1),则M-N等于() .

若M=1/3x(x+1)(x+2) N=1/3x(x-1)(x+1),则M-N等于() .
若M=1/3x(x+1)(x+2) N=1/3x(x-1)(x+1),则M-N等于() .

若M=1/3x(x+1)(x+2) N=1/3x(x-1)(x+1),则M-N等于() .
-1/(x-1)x(x+1)(x+2)

-1/[x(x-1)(x+1)(x+2)]