1.(1/3是三分之一,依此类推)1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/452.3/2-5/6+7/12-9/20+11/30-13/423.(括号不要打,我写只是为了分辨)1+(1/2+1)+(1/1+2+3)+……+(1/1+2+3+……+10)4.1/4+1/12+1/24+1/40+……+1/19800,第二题是假
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/12 21:52:29
![1.(1/3是三分之一,依此类推)1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/452.3/2-5/6+7/12-9/20+11/30-13/423.(括号不要打,我写只是为了分辨)1+(1/2+1)+(1/1+2+3)+……+(1/1+2+3+……+10)4.1/4+1/12+1/24+1/40+……+1/19800,第二题是假](/uploads/image/z/4098685-13-5.jpg?t=1.%281%2F3%E6%98%AF%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80%2C%E4%BE%9D%E6%AD%A4%E7%B1%BB%E6%8E%A8%291%2F3%2B1%2F6%2B1%2F10%2B1%2F15%2B1%2F21%2B1%2F28%2B1%2F36%2B1%2F452.3%2F2-5%2F6%2B7%2F12-9%2F20%2B11%2F30-13%2F423.%28%E6%8B%AC%E5%8F%B7%E4%B8%8D%E8%A6%81%E6%89%93%2C%E6%88%91%E5%86%99%E5%8F%AA%E6%98%AF%E4%B8%BA%E4%BA%86%E5%88%86%E8%BE%A8%291%2B%281%2F2%2B1%29%2B%281%2F1%2B2%2B3%29%2B%E2%80%A6%E2%80%A6%2B%EF%BC%881%2F1%2B2%2B3%2B%E2%80%A6%E2%80%A6%2B10%EF%BC%894.1%2F4%2B1%2F12%2B1%2F24%2B1%2F40%2B%E2%80%A6%E2%80%A6%2B1%2F19800%2C%E7%AC%AC%E4%BA%8C%E9%A2%98%E6%98%AF%E5%81%87)
1.(1/3是三分之一,依此类推)1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/452.3/2-5/6+7/12-9/20+11/30-13/423.(括号不要打,我写只是为了分辨)1+(1/2+1)+(1/1+2+3)+……+(1/1+2+3+……+10)4.1/4+1/12+1/24+1/40+……+1/19800,第二题是假
1.(1/3是三分之一,依此类推)
1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45
2.
3/2-5/6+7/12-9/20+11/30-13/42
3.(括号不要打,我写只是为了分辨)
1+(1/2+1)+(1/1+2+3)+……+(1/1+2+3+……+10)
4.
1/4+1/12+1/24+1/40+……+1/19800
,第二题是假分数
1.(1/3是三分之一,依此类推)1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/452.3/2-5/6+7/12-9/20+11/30-13/423.(括号不要打,我写只是为了分辨)1+(1/2+1)+(1/1+2+3)+……+(1/1+2+3+……+10)4.1/4+1/12+1/24+1/40+……+1/19800,第二题是假
第一题和第三题差不多,第一题拆成第三题那样做,然后利用n(n+1)/2 ,分母写成这种形式,你自己解下看看.
你把每项都写成那种形式,我帮你写一题,你自己看看.第三题,1+2/2*3+2/3*4+2/4*5.2/10*11 一不管,然后把2提出去,后面的就是可以拆成1/2-1/3+1/3-1/4.1/10-1/11 现在应该能看出来了..最后剩下1+2(1/2-1/11)=20/11
1. 4/5
2.(题目好像错了,3/2应为2/3,3/2的话是6/7,2/3的话是1/42)
3..(题目好像错了,1/1应为1/2,1/1的话是437/2,1/2的话是447/2)
4. 1/198
5. 9/10