4/1*3-8/3*5+12/5*7-16/7*9.-40/19*21

来源：学生作业帮助网 编辑：作业帮 时间：2024/04/29 16:14:11
4/1*3-8/3*5+12/5*7-16/7*9.-40/19*21

4/1*3-8/3*5+12/5*7-16/7*9.-40/19*21
4/1*3-8/3*5+12/5*7-16/7*9.-40/19*21

4/1*3-8/3*5+12/5*7-16/7*9.-40/19*21
4/1*3-8/3*5+12/5*7-16/7*9.-40/19*21
=1+1/3-1/3-1/5+1/5+1/7-1/7-1/9+……-1/19-1/21
=1-1/21
=20/21