E
Editor
Sep 18, 2022
If y=\frac{1}{\frac{1}{a}+\frac{1}{b}}, when a=1 and b=1/3, then y=?
Difficulty: Easy
A:
1/3
B:
1
C:
3
D:
1/4
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ID: 63273db5ca83163ac3a0a103