Question

Даю 20 балов! Срочно два примера по действиям пожалуйста!!! ​

Answer 1

1.

$1)( - 2.04 div frac{1}{25} - 3.61 div ( - frac{19}{40} )) div$

$div ( - 2 frac{4}{5} ) + 0.6 div ( - 0.9).$

решаем по действиям :

$1) - 2.04 div frac{1}{25} = - 2 frac{4}{100} div frac{1}{25} = - 2 frac{1}{25} div$

$div frac{1}{25} = - frac{51}{25} div frac{1}{25} = - frac{51}{25} times frac{25}{1} =$

$= - 51.$

$2)3.61 div ( - frac{19}{40} ) = - 3.61 div frac{19}{40} =$

$= - frac{361}{100} div frac{19}{40} = - frac{361}{100} times frac{40}{19} = - frac{14440}{1900} =$

$= - frac{38}{5} = - 7 frac{3}{5} .$

$3) - 51 - ( - 7 frac{3}{5} ) = - 51 + 7 frac{3}{5} = 7 frac{3}{5} -$

$- 51 = 7 + frac{3}{5} - 51 = frac{3}{5} - 44 = frac{3}{5} - frac{220}{5} =$

$= - frac{217}{5} = - 43 frac{2}{5} .$

$4)0.6 div ( - 0.9) = - frac{6}{9} = - frac{2}{3} .$

$5) - 43 frac{2}{5} div ( - 2 frac{4}{5} ) = 43 frac{2}{5} div 2 frac{4}{5} = frac{217}{5} div$

$div frac{14}{5} = frac{217}{5} times frac{5}{14} = frac{1085}{70} = frac{31}{2} = 15 frac{1}{2} .$

$6)5 frac{1}{2} + ( - frac{2}{3} ) = 15 frac{1}{2} - frac{2}{3} = frac{31}{2} - frac{2}{ 3} =$

$= frac{93}{6} - frac{4}{6} = frac{89}{6} = 14 frac{5}{6} .$

Ответ :

$14 frac{5}{6} .$

2.

$(7.7 div ( - frac{11}{40} ) - 3.8 div ( - frac{1}{20} )) times ( - frac{5}{16} ) -$

$- 0.4 div ( - 0.36).$

решаем по действиям :

$1)7.7 div ( - frac{11}{40} ) = - 7 frac{7}{10} div frac{11}{40} = - frac{77}{10} div$

$div frac{11}{40 } = - frac{77}{10} times frac{40}{11} = - 28.$

$2)3.8 div ( - frac{1}{20} ) = - 3 frac{8}{10} div frac{1}{20} = - frac{19}{5} div$

$div frac{1}{20} = - frac{19}{5} times frac{20}{1} = - frac{380}{5} = - 76.$

$3) - 28 - ( - 76) = 76 - 28 = 48.$

$4)0.4 div ( - 0.36) = frac{0.4}{ - 0.36} = - frac{40}{36} = - frac{10}{9} =$

$= - 1 frac{1}{9} .$

$5)48 times ( - frac{5}{16} ) = - 48 times frac{5}{16} = - frac{240}{16} =$

$= - 15.$

$6) - 15 - ( - 1 frac{1}{9} ) = - 15 + 1 frac{1}{9} = 1 frac{1}{9} -$

$- 15 = 1 + frac{1}{9} - 15 = frac{1}{9} - 14 = frac{1}{9} - frac{126}{9} =$

$= - frac{125}{9} = - 13 frac{8}{9} ( - 13.9).$

Ответ :

$- 13 frac{8}{9} .$