Question

Simplify the following into rational number : (5^-1 - 7^-1)^-1

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Answer 1

Answer:

the right answer is 35/2.

Answer 2

Answer:

17.5

Step-by-step explanation:

$( \frac{1}{5} - \frac{1}{7} ) {}^{ - 1}$

(2/35)^-1

(35/2)

17.5