Question

1. 5 9/14 - 2 3/7 + 6,7
2. 9 1/4 * 8 - 1 2/3 * 5 1/2 - 2 4/5 * 2 11/12
СРОЧНО, 30Б!+РЕШЕНИЕ

Answer 1

$5 frac{9}{14} - 2 frac{3}{7} + 6.7 = 5 frac{9}{14} - 2 frac{6}{14} + 6.7 = 3 frac{3}{14} + 6 frac{7}{10} =3 frac{15}{70} + 6 frac{49}{70} = 9 frac{64}{70} =9 frac{32}{35}$

$9 frac{1}{4} times 8 - 1 frac{2}{3} times 5 frac{1}{2} - 2 frac{4 }{5} times 2 frac{11}{12} = 56 frac{2}{3} \ 1) : 9 frac{1}{4} times 8 = frac{37 times 8}{4} = 37 times 2 = 74 \ 2) : 1 frac{2}{3} times 5 frac{1}{2} = frac{5 times 11}{3 times 2} = frac{55}{6} = 9 frac{1}{6} \ 3) : 2 frac{4}{5} times 2 frac{11}{12} = frac{14 times 35}{5 times 12} = frac{7 times 7}{6} = frac{49}{6} = 8 frac{1}{6} \ 4) : 74 - 9 frac{1}{6} - 8 frac{1}{6} = 56 frac{4}{6} =56 frac{2}{3}$