Question

Срочно допоможіть!!!!​

Answer 1

$- 1 \frac{7}{25} a \times ( - \frac{5}{8} b) \div ( - \frac{1}{5} ) = \\ - \frac{32 \times 5 \times 5}{25 \times 8} ab= - 4ab$

$1.4a - (2.5 - a) + (1.3 - 2.3a) = \\ 1.4a - 2.5 + a + 1.3 - 2.3a = \\ 0.1a - 1.2$

$2 \frac{1}{3} ( \frac{3}{7} x - 3y) - 2( - y - x) = \\ \frac{7 \times 3}{3 \times 7} x - \frac{7 \times 3}{3} y + 2y + 2x = \\ x - 7y + 2y + 2x = 3x - 5y$

$\frac{5}{12} (4.8x - 1.2y) - 3.6( \frac{2}{9} x + \frac{7}{12} y) = \\ \frac{5 \times 24}{12 \times 5} x - \frac{5 \times 12}{12 \times 10} y - \frac{18 \times 2}{5 \times 9} x - \frac{18 \times 7}{5 \times 12} y = \\ 2x - 0.5y - 0.8x - 2.1y = 1.2x - 2.6y$