3分之5-(7分之3+14分之9)等于多少啊?
问题描述:
3分之5-(7分之3+14分之9)等于多少啊?
答
5/3-(3/7+9/14)
=5/3-(6/14+9/14)
=5/3-15/14
=70/42-45/42
=25/42