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12.7 20.9 31.1 43.3

3/2+7/6+13/12+21/20+31/30+43/42 =1+1/2+1+1/6+1+1/12+1+1/20+1+1/30+1+/42 =6+1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7 =7-1/7 =48/7 =6又6/7

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