1/1X3+1/3X5+1/5X7.+1/49X51=?1为分子,1X3为分母
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 22:52:51
![1/1X3+1/3X5+1/5X7.+1/49X51=?1为分子,1X3为分母](/uploads/image/z/5216957-53-7.jpg?t=1%2F1X3%2B1%2F3X5%2B1%2F5X7.%2B1%2F49X51%3D%3F1%E4%B8%BA%E5%88%86%E5%AD%90%2C1X3%E4%B8%BA%E5%88%86%E6%AF%8D)
1/1X3+1/3X5+1/5X7.+1/49X51=?1为分子,1X3为分母
1/1X3+1/3X5+1/5X7.+1/49X51=?
1为分子,1X3为分母
1/1X3+1/3X5+1/5X7.+1/49X51=?1为分子,1X3为分母
=1/2(1-1/3)-1/2(1/3-1/5)+1/2(1/5-1/7).+1/2(1/49-1/51)
=1/2(1-1/3+1/3-1/5+1/5.-1/49+1/49-1/51)
=1/2(1-1/51)
=1/2X50/51
=25/51