已知a/b=7/3,则a+b/a−b=_.

问题描述:

已知

a
b
7
3
,则
a+b
a−b
=______.

设a=7t,则b=3t(t≠0),

a+b
a−b
=
7t+3t
7t−3t
=
10t
4t
=
5
2

故答案为
5
2