Question

1/(1/35-1/60) сколько будет? ??

Answer 1

$displaystyle frac{1}{ frac{1}{35}- frac{1}{60} }= frac{1}{ frac{1}{5*7}- frac{1}{5*12} }= frac{1}{ frac{12-7}{5*7*12} }=frac{1}{ frac{5}{5*7*12} }=frac{1}{ frac{1}{84} }=84$