[17/25-(2/5+3/20]×2/13

来源：学生作业帮助网编辑：作业帮时间：2024/05/09 12:44:36

[17/25-(2/5+3/20]×2/13
[17/25-(2/5+3/20]×2/13

[17/25-(2/5+3/20]×2/13
[17/25-(2/5+3/20)]X2/13
=[17/25-11/20]X2/13
=13/100X2/13
=1/50