1/42+1/56+1/72+1/90+1/110
=1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11
=1/6-1/11
=5/66
递等式计算 1/42+1/56+1/72+1/90+1/110
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