Предмет: Математика, автор: Euprill

Помогите пожалуйста с математикой

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Ответы

Автор ответа: dianabagrova97
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}

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