Question

Нужна помощь решить задания

Answer 1

Ответ:

$1)x \div 1 \frac{5}{31 } = 7 \frac{3}{4} \div \frac{1}{3} \\ x = 3 \times 7 \frac{3}{4} \times 1 \frac{5}{31} \\ x = 3 \times \frac{31}{4} \times \frac{36}{31} \\ x = 3 \times 9 \\ x = 27 \\ 2) \frac{x}{0.6} = \frac{25}{3} \\ \frac{x}{ \frac{3}{5} } = \frac{25}{3} \\ \frac{5x}{3} = \frac{25}{3} \\ 5x = 25 \\ x = 5$

Answer 2

$\frac{x}{1} \div \frac{5 + 31}{31} = \frac{28 + 3}{4} \div \frac{1}{3}$

$\frac{x \times 31}{1 \times 36} = \frac{31 \times 3}{4 \times 1}$

$\frac{31x}{36} = \frac{93}{4}$

перекресно умножить

$31x \times 4 = 36 \times 93 \\ 124x = 3348 \\ x = 27$

б)

$\frac{x}{0.6} = \frac{25}{3}$

$3x = 25 \times 0.6 \\ 3x = 15 \\ x = 5$