Question

Помогите решить по действиям!
18×(11/12 - 8/9) : (5/4 + 2/7)=?
11/12, 8/9, 5/4, 2/7 - это дроби.

Answer 1

1)11/12-8/9=33/36-32/36=1/36

2)5/4+2/7=35/28+8/28=1 15/28

3)18×1/36=1/2

4)1/2:1 15/28=1/2×28/43=14/43

Ответ:14/43

Answer 2

$18cdot (frac{11}{12}-frac{8}{9})div(frac{5}{4} + frac{2}{7})=bf frac{14}{43} \ \ 1)frac{{11}^{(cdot6}}{12} - frac{{8}^{( cdot 8}}{9}=frac{66}{72} - frac{64}{72} = frac{66-64}{72} = frac{{2}^{(div 2}}{72} = bf frac{1}{36} \ \ 2)frac{5^{ ( cdot 7}}{4} + frac{{2}^{(cdot 4}}{7} = frac{35}{28} + frac{8}{28} = frac{35+8}{28}=bf frac{43}{28}= 43 div 28 = 1frac{15}{28} \ \ 3)18 cdot frac{1}{36} = frac{18 cdot 1}{36} = frac {{18}^{(div 6}}{36}= frac{{3}^{(div 3}}{6} =bf frac{1}{2} \ \ 4)frac{1}{2}div frac{43}{28} = frac{1}{2} cdot frac{28}{43} = frac{1 cdot 14}{1cdot 43} =bf frac{14}{43}$