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请1/1x2x3+1/2x3x4+1/3x4x5+1/4x5x6=
人气:124 ℃ 时间:2019-12-19 07:14:26
解答
=1/2×(1/1×2-1/2×3+1/2×3-1/3×4+1/3×4-1/4×5+1/4×5-1/5×6)
=1/2×(1/1×2-1/5×6)
=7/30
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