Question

Прошу подробного описания

Answer 1

$frac{1}{ frac{1}{35} - frac{1}{60} } = frac{1}{ frac{1 times 12}{35 times 12} - frac{1 times 7}{60 times 7} } = frac{1}{ frac{12}{420} - frac{7}{420} } = frac{1}{ frac{5}{420} } = frac{420}{5} = 84$

Answer 2

1) 1/35-1/60=12/420-7/420=5/420=1/84

2)1: 1/84=1*84=84