已知a/b=7/3,则a+b/a−b=_.
问题描述:
已知
=a b
,则7 3
=______. a+b a−b
答
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