Question

СРОЧНО ДАЮ 60 БАЛЛОВ

Answer 1

3.

а)

$- 2.5(5.7 - x) = 0 \\ 5.7 - x = 0 \\ x = 5.7$

б)

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

в)

$- x \div ( - 2.4) = 3.05 \\ - x = 3.05 \times ( - 2.4) \\ - x = - 7.32 \\ x = 7.32$

4.

$9 \frac{1}{2} \div 19 - 12.7 \div ( - 10) + 11 \frac{9}{10} \div 14 = \frac{19}{2 \times 19} + 1.27 + \frac{119}{10 \times 14} = \\ = \frac{1}{2} + 1.27 + \frac{17}{20} = 0.5 + 0.85 + 1.27 = 0.9 + 1.27 = 2.17$