1X2X3+2X3X4+3X4+.+nx(n+1)(n+2)=

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1X2X3+2X3X4+3X4+.+nx(n+1)(n+2)=1X2X3+2X3X4+3X4+.+nx(n+1)(n+2)=1X2X3+2X3X4+3X4+.+nx(n+1)(n+2)=好题啊!

1X2X3+2X3X4+3X4+.+nx(n+1)(n+2)=
1X2X3+2X3X4+3X4+.+nx(n+1)(n+2)=

1X2X3+2X3X4+3X4+.+nx(n+1)(n+2)=
好题啊!