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Please 1 / 1x2x3 + 1 / 2x3x4 + 1 / 3x4x5 + 1 / 4x5x6=
=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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