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