(5/4-0.8)/0.63-(3/4/0.45-7/5)

来源:学生作业学帮网 编辑:学帮网 时间:2024/06/05 19:21:31

(5/4-0.8)/0.63-(3/4/0.45-7/5)

=(1.25-0.8)/0.63-[(15/20)/(9/20)-7/5]
=(45/100)/(63/100)-(5/3-7/5)
=45/63-(25/15-21/15)
=5/7-4/15
=47/105