1/(7*9)+1/(9*11)+1/(11*13)······1/(49*51)就是7*9分之1 9*11分之1 11*13分之1···各位帮帮忙了
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 03:34:32
![1/(7*9)+1/(9*11)+1/(11*13)······1/(49*51)就是7*9分之1 9*11分之1 11*13分之1···各位帮帮忙了](/uploads/image/z/1071810-18-0.jpg?t=1%2F%287%2A9%29%2B1%2F%289%2A11%29%2B1%2F%2811%2A13%29%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B71%2F%2849%2A51%29%E5%B0%B1%E6%98%AF7%2A9%E5%88%86%E4%B9%8B1++9%2A11%E5%88%86%E4%B9%8B1++11%2A13%E5%88%86%E4%B9%8B1%C2%B7%C2%B7%C2%B7%E5%90%84%E4%BD%8D%E5%B8%AE%E5%B8%AE%E5%BF%99%E4%BA%86)
1/(7*9)+1/(9*11)+1/(11*13)······1/(49*51)就是7*9分之1 9*11分之1 11*13分之1···各位帮帮忙了
1/(7*9)+1/(9*11)+1/(11*13)······1/(49*51)
就是7*9分之1 9*11分之1 11*13分之1···
各位帮帮忙了
1/(7*9)+1/(9*11)+1/(11*13)······1/(49*51)就是7*9分之1 9*11分之1 11*13分之1···各位帮帮忙了
1/2*(1/7-1/51)=22/357
1/(7*9)=1/2*(1/7-1/9)
…………
wolai