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cestrela7 [59]
3 years ago
13

Someone please help me

Mathematics
1 answer:
Anika [276]3 years ago
6 0

Answer:

A

Step-by-step explanation:

Given

a = \frac{1}{x} - \frac{1}{y} = \frac{y-x}{xy} ← as a single fraction

Thus

\frac{1}{a} = \frac{1}{\frac{y-x}{xy} } = \frac{xy}{y-x} → A

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