Question

решите пожалуйста 3 и 4 задание очень прошу!!!

Answer 1

3.

а)

$(0.5 - \frac{3}{8} ) \div 0.2 + \frac{1}{4} = \frac{5}{10} \div \frac{2}{10} - \frac{3}{8} \div \frac{2}{10} + \frac{1}{4} = \frac{5}{10} \times \frac{10}{2} - \frac{3}{8} \times \frac{10}{2} + \frac{1}{4} = \\ \\ = \frac{5}{2} - \frac{15}{8} + \frac{1}{4} = \frac{20}{8} - \frac{15}{8} + \frac{2}{8} = \frac{7}{8} = 0.875$

б)

$(( - 4.5) \times \frac{16}{3} + ( - 5.5) \times \frac{16}{3} ) \times 0.2 = (\frac{16}{3} ( - 4.5 - 5.5)) \times 0.2 = \\ \\ = ( \frac{16}{3} \times ( - 10)) \times \frac{2}{10} = - \frac{160}{3} \times \frac{2}{10} = - \frac{32}{3} = - 10 \frac{2}{3}$

4.

а)

$5x - 8 = 3x + 8 \\ \\ 5x - 3x = 8 + 8 \\ \\ 2x = 16 \\ \\ x = 8$

б)

$- 2x = \frac{1}{4} \\ \\ x = - \frac{1}{8}$