Question

помогите пожалуйста умоляю решить

Answer 1

$1) frac{7}{15} - frac{3}{40} = frac{56}{120} - frac{9}{120} = frac{47}{120}$
$2) frac{47}{120} - frac{1}{24} = frac{47}{120} - frac{5}{120} = frac{42}{120} =$
$= frac{7}{20}$
$3) frac{7}{20} div frac{7}{10} = frac{7}{20} times frac{10}{7} = frac{1}{2}$
$4) frac{24}{10} times frac{1}{3} = frac{8}{10} = frac{4}{5}$
$5) frac{4}{5} - 3 = frac{4}{5} - 2 frac{5}{5} = - 2 frac{1}{5}$
$6) - 2 frac{1}{5} times frac{5}{11} = - frac{11}{5} times frac{5}{11} = - 1$
$7)frac{1}{2} div ( - 1) = - 1 frac{1}{2}$
$8) frac{3}{4} - 1 frac{2}{3} = frac{9}{12} - 1 frac{8}{12} = frac{9}{12} - frac{20}{12} =$
$= - frac{11}{12}$
$9)1 frac{5}{6} div ( - frac{11}{12} ) = frac{11}{6} times ( - frac{12}{11} ) = \ = - 2$
$10) frac{4}{9} - frac{5}{12} = frac{16}{36} - frac{15}{36} = frac{1}{36}$
$11) frac{1}{36} + frac{75}{100} = frac{1}{36} + frac{3}{4} = frac{1}{36} + frac{27}{36} =$
$= frac{28}{36} = frac{7}{9}$
75/100 сократили на 25, то есть разделили числитель и знаменатель на 25
$11) frac{7}{9} times frac{3}{7} = frac{1}{3}$
$12) - 2 div frac{1}{3} = - 2 times frac{3}{1} = - 6$
$13) - 1 frac{1}{2} times ( - 6) = - frac{3 }{2} times ( - frac{6}{1} ) =$
$= 9$
Ответ:9