Question

5. 20 балов пжппжпжпжпжпж​

Answer 1

Ответ: 1) x = 3/20 = 0,15 ; 2) x = 12 .

Пошаговое объяснение:

5 . 1) 4x = 3/5 ;

x = 3/5 : 4 ;

x = 3/20 = 0,15 ;

2) 9/10 x - 4/15 x = 7 3/5 ;

19/30 x = 7 3/5 ;

x = (7 3/5 ):( 19/30 ) ;

x = 12 .

Answer 2

Пошаговое объяснение:

$4x = \frac{3}{5} \\ x = \frac{3}{5} \div \frac{4}{1} = \frac{3 \times 1}{5 \times 4} \\ x = \frac{3}{12} = \frac{1}{4}$

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$\frac{9}{10} x - \frac{4}{15} x = 7 \frac{3}{5} \\ \\ \frac{27}{30} x - \frac{8}{30} x = 7 \frac{3}{5} \\ \\ \frac{19}{30} x = 7 \frac{3}{5} \\ \\ \frac{19}{30} x = \frac{38}{5} \\ \\ x = \frac{38}{5} \div \frac{19}{30} = \frac{38}{5} \times \frac{30}{19} = \frac{2}{1} \times \frac{6}{1} \\ \\ x = \frac{12}{1} = 12$