[17/25-(2/5+3/20]×2/13

来源:学生学帮网 编辑:学帮网 时间:2024/06/01 04:00:46

[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