2/3+1/6+1/9+1/12+1/15+1/18=

题目详情

▼优质解答

答案和解析

(1/3)(2+1/2+1/3+1/4+1/5+1/6)
=(1/3)(2+1-1/6+1/6+9/20)
=(1/3)(3+9/20)
=(1/3)(69/20)
=23/20

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