问题描述:
1+1/2-1/3+1/4-1/5+1/6-1/7+1/8-1/9+1/10-1/11+1/12等于多少要分数的答案谢谢
问题描述:
1+1/2-1/3+1/4-1/5+1/6-1/7+1/8-1/9+1/10-1/11+1/12等于多少要分数的答案谢谢
9613/27720 先算偶数相加,再奇数相加 偶数减奇数 这是什么的题啊,考计算,耐心
1+(1-1/2)+(1/2-1/3)+...+(1/9-1/10)+(1/10-1/11)=20/11 原题=1+1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+....+1/10-1/11 =1+1-1/11=21/11 1+1/2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10+1/10*11 =1+1/2+(1/2-1/3)+(1/3-1/4)+……+(1/10-1/11) =1+1-1/11 =1+1-1/11 =21/11 1+1/2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10+1/10*11 =1+(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+()1/6-1/7+(1/7-1/8)+(1/8-1/9)+(1/9-1/10)+(1/10-1/11) =1+1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+)1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/10-1/11 =1+1-1/11 =21/11
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1吧??
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