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数学
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1×2×3+2×3×4+3×4×5……+7×8×9 简算?
人气:116 ℃ 时间:2019-12-23 03:10:37
解答
1×2×3+2×3×4+3×4×5……+7×8×9
=1/4×7×8×9×10
=1260
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