Question

Помогите пожалуйста

Answer 1

$\frac{1}{30}$ + $\frac{1}{42}$ = $\frac{7}{210}$ + $\frac{5}{210}$ = $\frac{12}{210}$

1: $\frac{12}{210}$ = $\frac{1}{1}$ * $\frac{12}{210}$ = $\frac{1*12}{1*210}$ = $\frac{35}{2}$ = 17 $\frac{1}{2}$

Answer 2

1:(1/30+1/42)=1:2/35=35/2=17 1/2=17,5