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 :

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