10518+(1845*267+62238*(39832-39326))*41=1.151099е10
7*(11-3)-(54/9)*(28/7)=7*(11-3)-9*(28/7)=7*(11-3)-9*4=7*8-9*4=56-9*4=56-36=20
1.
![(7 \frac{8}{9} -5 \frac{5}{6} ) - 1 \frac{7}{18} = (7-5-1) + ( \frac{8}{9} - \frac{5}{6}- \frac{7}{18} ) = 1+ \frac{16-15-7}{18} = 1- \frac{6}{18}](https://tex.z-dn.net/?f=%287+%5Cfrac%7B8%7D%7B9%7D+-5+%5Cfrac%7B5%7D%7B6%7D+%29+-+1+%5Cfrac%7B7%7D%7B18%7D+%3D+%287-5-1%29+%2B+%28+%5Cfrac%7B8%7D%7B9%7D+-+%5Cfrac%7B5%7D%7B6%7D-+%5Cfrac%7B7%7D%7B18%7D++%29+%3D+1%2B+%5Cfrac%7B16-15-7%7D%7B18%7D+%3D+1-+%5Cfrac%7B6%7D%7B18%7D)
![=1- \frac{1}{3}](https://tex.z-dn.net/?f=%3D1-+%5Cfrac%7B1%7D%7B3%7D+)
Здесь на 3ем шаге нужно привести дроби к общему знаменателю - 18.
2.
![19 \frac{11}{28}-(8 \frac{3}{4}+10 \frac{1}{7})=19 \frac{11}{28}+8 \frac{3}{4}-10 \frac{1}{7}=(19+8-10)+(\frac{11}{28}+\frac{3}{4}-\frac{1}{7})](https://tex.z-dn.net/?f=19+%5Cfrac%7B11%7D%7B28%7D-%288+%5Cfrac%7B3%7D%7B4%7D%2B10+%5Cfrac%7B1%7D%7B7%7D%29%3D19+%5Cfrac%7B11%7D%7B28%7D%2B8+%5Cfrac%7B3%7D%7B4%7D-10+%5Cfrac%7B1%7D%7B7%7D%3D%2819%2B8-10%29%2B%28%5Cfrac%7B11%7D%7B28%7D%2B%5Cfrac%7B3%7D%7B4%7D-%5Cfrac%7B1%7D%7B7%7D%29)
![=17+ \frac{11+28-4}{28} =17+ \frac{35}{28}=18 \frac{7}{28} =18 \frac{1}{4}.](https://tex.z-dn.net/?f=%3D17%2B+%5Cfrac%7B11%2B28-4%7D%7B28%7D+%3D17%2B+%5Cfrac%7B35%7D%7B28%7D%3D18+%5Cfrac%7B7%7D%7B28%7D++%3D18+%5Cfrac%7B1%7D%7B4%7D.)
Сначала нужно раскрыть скобки, затем сложить целые части и привести дробные к общему знаменателю.
Надеюсь понятно:)