Question

Помогите пожалуйста с математикой

Answer 1

Пошаговое объяснение:

$( - \frac{4}{15} + \frac{7}{12} ) \div ( - \frac{38}{45} ) = ( - \frac{16}{60} + \frac{35}{60} ) \div ( - \frac{38}{45} ) = \frac{19}{60} \div ( - \frac{38}{45} ) = \frac{19}{60} \times ( - \frac{45}{38} ) = \frac{1}{4} \times ( - \frac{3}{2} ) = - \frac{3}{8}$

$2)( \frac{11}{16} - ( - \frac{17}{24} )) \div ( - 5 \frac{7}{12} ) = ( \frac{33}{48} - ( - \frac{34}{48} )) \div ( - \frac{67}{12} ) = \frac{67}{48} \times ( - \frac{12}{67} ) = \frac{1}{4} \times ( - \frac{1}{1} ) = - \frac{1}{4}$

$3)( - \frac{11}{18} + \frac{29}{45} ) \div ( \frac{35}{54} - \frac{19}{27}) = ( - \frac{55}{90} + \frac{58}{90} ) \div ( \frac{35}{54} - \frac{38}{54} ) = \frac{3}{90} \div ( - \frac{3}{54}) = \frac{1}{30} \times ( - \frac{18}{1} ) = \frac{1}{5} \times ( - \frac{3}{1} ) = - \frac{3}{5}$

$4) - 4 \frac{1}{7} + 2 \frac{1}{4} \times ( - 11 \frac{2}{9} - ( - 5.4) \div \frac{9}{35} ) = - 4 \frac{1}{7} + 2 \frac{1}{4} \times ( - 11 \frac{2}{9} - ( - \frac{54}{10} ) \times \frac{35}{9} )= - 4 \frac{1}{7} + 2 \frac{1}{4} \times ( - 11 \frac{2}{9} - ( - 21)) = - 4 \frac{1}{7} + 2 \frac{1}{4} \times ( - \frac{101}{9} - ( - \frac{21}{1} )) = - 4 \frac{1}{7} + 2 \frac{1}{4} \times ( - \frac{101}{9} - ( - \frac{189}{9} )) = - 4 \frac{1}{7} + \frac{9}{4} \times \frac{88}{9} = - 4 \frac{1}{7} + \frac{1}{1} \times \frac{22}{1} = - \frac{29}{7} + \frac{22}{1} = - \frac{29}{7} + \frac{154}{7} = \frac{125}{7} = 17 \frac{6}{7}$