Question

А) 4/7х=20
Б) 4 1/15-1 4/25х1 1/6

Answer 1

Ответ:

$\frac{4}{7} x = 20 \\ x = 20 \div \frac{4}{7} = 20 \times \frac{7}{4} = 5 \times 7 \\ x = 35$

___________________

$4 \frac{1}{15} - 1 \frac{4}{25} x = 1 \frac{1}{6} \\ - 1 \frac{4}{25} x = 1 \frac{1}{6} - 4 \frac{1}{15} = - 3 \frac{2 - 5}{30} = - 2 \frac{32 - 5}{30} = - 2 \frac{27}{30} = - 2 \frac{9}{10} \\ - 1 \frac{4}{25} x= - 2 \frac{9}{10} = - 2.9$

$x = - 2.9 \div ( - 1 \frac{4}{25} ) \\ x = - 2.9 \div ( - 1.16) \\ x = 2.5$