Question

Найдите сумму дробей 2/3+1/12, 1/12+1/6+3/4,3/20+1/5+1/6

Answer 1

$\frac{2}{3}+ \frac{1}{12}= \frac{2*4+1}{12}= \frac{9}{12}= \frac{3}{4}$
$\frac{1}{12}+ \frac{1}{6}+ \frac{3}{4}= \frac{1+2+9}{12}= \frac{12}{12}=1$
$\frac{3}{20} + \frac{1}{5}+ \frac{1}{6}= \frac{18+24+20}{120}= \frac{62}{120}= \frac{31}{60}$
Надеюсь, помог