вычислите (3/8 - 7/12)*3,6 +(5/18+2/27):1 11/27

Задание: вычислить
( $\frac{3}{8}$ - $\frac{7}{12}$ )*3,6 +( $\frac{5}{18}$ + $\frac{2}{27}$ ):1 $\frac{11}{27}$ = -0,5

1) $\frac{3}{8}$ - $\frac{7}{12}$ = $\frac{3*3}{3*8}$ - $\frac{2*7}{2*12}$ = $\frac{9}{24}$ - $\frac{14}{24}$ = - $\frac{5}{24}$
2) - $\frac{5}{24}$ *3,6=- $\frac{5}{24}$ * $\frac{36}{10}$ =- $\frac{5}{24}$ * $\frac{18}{5}$ = - $\frac{5*18}{24*5}$ = - $\frac{18}{24}$ = - $\frac{3}{4}$

3) $\frac{5}{18}$ + $\frac{2}{27}$ = $\frac{3*5}{3*18}$ + $\frac{2*2}{2*27}$ = $\frac{15}{54}$ + $\frac{4}{54}$ = $\frac{19}{54}$
4) $\frac{19}{54}$ : 1 $\frac{11}{27}$ = $\frac{19}{54}$ : $\frac{38}{27}$ = $\frac{19*27}{54*38}$ = $\frac{1*1}{2*2}$ = $\frac{1}{4}$

5)- $\frac{3}{4}$ + $\frac{1}{4}$ = $\frac{-3+1}{4}$ = - $\frac{2}{4}$ = - $\frac{1}{2}$ = -0,5