Question

Помогите решить премеры, пожалуйста

Answer 1

шестое не видно но вот остальное

Answer 2

Прошу побыстрей

Answer 3

$1 - frac{2}{7} = frac{7}{7} - frac{2}{7} = frac{5}{7}$

$frac{3}{5} + frac{7}{15} = frac{9}{15} + frac{7}{15} = frac{16}{15} = 1 frac{1}{15}$
$frac{4}{7} + frac{1}{21} = frac{12}{21} + frac{1}{21} = frac{13}{21}$
$frac{5}{6} - frac{2}{5} = frac{25}{30} - frac{12}{30} = frac{13}{30}$
$1 frac{1}{2} - frac{3}{8} = 1 frac{4}{8} - frac{3}{8} = 1 frac{1}{8}$
$2 frac{1}{2} + 3 frac{1}{5} = 5 frac{5 + 2}{10} = 5 frac{7}{10}$
$frac{2}{3} times frac{6}{7} = frac{2 times 2}{1 times 7} = frac{4}{7}$
$1 frac{1}{2} times 2 frac{3}{5} = frac{3}{2} times frac{13}{5} = frac{39}{10} = 3 frac{9}{10}$
$8 frac{1}{2} times 4 = frac{17 times 4}{2 times 1} = frac{17 times 2}{1 times 1} = frac{34}{1} = 34$
$2 frac{1}{5} div frac{2}{3} = frac{11}{5} times frac{3}{2} = frac{33}{10} = 3 frac{3}{10}$
$frac{6}{7} div frac{3}{8} = frac{6}{7} times frac{8}{3} = frac{2 times8 }{ 7times 1} = frac{16}{7} = 2frac{2}{7}$
$17 frac{1}{2} div 2 = frac{35}{2} div frac{2}{1} = frac{35}{2} times frac{1}{2} = frac{35}{4} = 8 frac{3}{4}$
$4 frac{1}{2} div 2 frac{1}{5} = frac{9}{2} div frac{11}{5} = frac{9}{2} times frac{5}{11} = frac{45}{22} = 2 frac{1}{22}$
$6 div 2 frac{1}{5} = frac{6}{1} div frac{11}{5} = frac{6}{1} times frac{5}{11} = frac{30}{ 11 } = 2 frac{8}{11}$
$frac{2}{3} times frac{6}{7} div frac{1}{2} = frac{2 times 2}{1 times 7} times frac{2}{1} = frac{4 times 2}{7 times 1} = frac{8}{7} = 1frac{1}{7}$