若1/a+1/b=2,则a+ab+b/2a+2b=_.

问题描述:

1
a
+
1
b
=2,则
a+ab+b
2a+2b
=______.

∵若

1
a
+
1
b
=2,
a+b
ab
=2,
∴a+b=2ab,
原式=
(a+b)+ab
2(a+b)
=
2ab+ab
2×2ab
=
3ab
4ab
=
3
4

故答案为
3
4