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原式=1/2-1/3-1/3+1/4-1/4+1/5-1/5+1/6.1/39+1/40
=1/2-2/3+1/40
=-17/120
1/2X1/3-1/3X1/4-1/4X1/5-1/5X1/6.1/39X1/40
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