5/6-7/12+9/20-11/30+13/42-15/56+.+41/420-43/462=
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/20 21:51:54
![5/6-7/12+9/20-11/30+13/42-15/56+.+41/420-43/462=](/uploads/image/z/10906004-20-4.jpg?t=5%2F6-7%2F12%2B9%2F20-11%2F30%2B13%2F42-15%2F56%2B.%2B41%2F420-43%2F462%3D)
5/6-7/12+9/20-11/30+13/42-15/56+.+41/420-43/462=
5/6-7/12+9/20-11/30+13/42-15/56+.+41/420-43/462=
5/6-7/12+9/20-11/30+13/42-15/56+.+41/420-43/462=
5/6-7/12+9/20-11/30+13/42-15/56+.+41/420-43/462
=1/2+1/3-1/3-1/4+1/4+1/5-1/5-1/6+1/6+1/7-1/7-1/8+……+1/20+1/21-1/21-1/22
=1/2-1/22
=5/11