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1-1/2+1/3-1/4+1/5-1/6+…+1/15=23*[1/()+1/()+1/()+1/()]

题目详情
1-1/2+1/3-1/4+1/5-1/6+…+1/15=23*[1/( )+1/( )+1/( )+1/( )]
▼优质解答
答案和解析
1-1/2+1/3-1/4+1/5-1/6+…+1/15 =1+1/2+1/3+1/4+1/5+1/6+…+1/15-1-1/2-1/3-1/4-1/5-1/6-1/7 =1/8+1/9+1/10+1/11+1/12+1/13+1/14+1/15 8+15=23 9+14=23 . 1/23×(1/8+1/15)=1/120 1/23×(1/9+1/14)...
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