3/2-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90...急
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/26 02:28:30
![3/2-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90...急](/uploads/image/z/1590212-20-2.jpg?t=3%2F2-5%2F6%2B7%2F12-9%2F20%2B11%2F30-13%2F42%2B15%2F56-17%2F72%2B19%2F90...%E6%80%A5)
3/2-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90...急
3/2-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90...急
3/2-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90...急
3/2-5/6+7/12-9/20+11/30-13/42+15/56-17/72+19/90
=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+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+1/10
=11/10