Question

3у-6х/10у + 15у-5/10у
4а+7в/5 - 5а-3в/4

Answer 1

Объяснение:

$\frac{3y - 6x}{10y} + \frac{15y - 5}{10y} = \frac{3y - 6x}{10y} + \frac{5(3y - 1)}{10y} = \frac{3y - 6y}{10y} + \frac{3y - 1}{2y} = \frac{3y - 6 x + 5(3y - 1)}{10y} = \frac{3y - 6x + 15y - 5}{10y} = \frac{18y - 6x - 5}{10y}$

$\frac{4a + 7b}{5} - \frac{5a - 3b}{4} = \frac{4(4a + 7b) - 5(5a - 3b)}{20 } = \frac{16a + 28b - 25a + 15b}{20} = \frac{ - 9a + 43b}{20}$