Предмет: Математика, автор: Аноним

помогите пожалуйста разобраться в материалах !!!!! срочно матем​

Приложения:

Ответы

Автор ответа: almaserzhanbek
1

Ответ:

1.5- 3/4 или 0,25

Пошаговое объяснение:

ну я понял это потому что я умный

Автор ответа: Alex97797
1

Ответ:

1.5. B) 0.75

2.2. 1\frac{5}{9}

2.3. x=1,75

Пошаговое объяснение:

1.5. \frac{18}{36}*\frac{21}{14}  =/первая дробь сокращается на 18, вторая - на 7/=\frac{1}{2} *\frac{3}{2} =\frac{3}{4}

2.2. \frac{5}{9} +\frac{12}{7}*(\frac{14}{3}-\frac{21}{8})/\frac{7}{4} =\frac{5}{9} +\frac{12}{7}*\frac{14*8-21*3}{24}*\frac{4}{7} =\frac{5}{9} +\frac{112-63}{49} =\frac{5}{9} +1=1\frac{5}{9}

2.3. 3,5*x+7,875=14

      3,5x=6,125

      x=1,75

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