Question

Heeeeeeeeelp помогите зделать 2 и 3
Пжжжжж

Answer 1

2.

$(2.1x - 6.3) \times (0.24 + 8x) = 0 \\ ( \frac{21}{10}x - \frac{63}{10}) \times ( \frac{6}{25} + 8x) = 0 \\ \frac{21}{10}x - \frac{63}{10} = 0 \\ \frac{6}{25} + 8x = 0 \\ x = 3 \\ x = - \frac{3}{100}$

3.

$3(0.5m + 0.7) - 5(0.3m - 0.4) = 1.5m + 2.1 - 1.5m + 2 = 4.1 = \frac{41}{10} = 4 \frac{1}{10}$