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

题目详情

▼优质解答

答案和解析

1-1/2+1/3-1/4+1/5-1/6+1/7-1/8+1/9-1/10
=(1-1/2)+(1/3-1/4).(1/9-1/10)
=1/2+1/12+1/30+1/56+1/90

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