1/2×1/3+1/3×1/4+1/4×1/5+1/5×1/6+1/6×1/7 +1/7×1/8+1/8×1/9+1/9×1/10

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1/2×1/3+1/3×1/4+1/4×1/5+1/5×1/6+1/6×1/7 +1/7×1/8+1/8×1/9+1/9×1/10

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