计算1/30+1/42+1/56+1/72+1/90

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▼优质解答

答案和解析

1/30+1/42+1/56+1/72+1/90
=1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10
=1/5-1/10
=1/10

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