1x2x3+2x3x4+3x4x5+…+8x9x10
人气：170 ℃ 时间：2020-04-13 10:08:28
解答
1×2×3+2×3×4+3×4×5+……+8×9×10=(1/4)(1×2×3×4)+(1/4)(2×3×4×5-1×2×3×4)+(1/4)(3×4×5×6-2×3×4×5)+……(1/4)(8×9×10×11-7×8×9×10)=(1/4)(1×2×3×4+2×3×4×5-1×2×3×4+3×4×5×6-...
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