1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11
人气：341 ℃ 时间：2020-01-24 12:26:56
解答
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11
=10×（10+1）×（10+2）÷3
=10×11×12÷3
=110×12÷3
=1320÷3
=440
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