Question

помогите пожалуйста
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Answer 1

1.

$\frac{a}{4} + \frac{a - 2}{3} = \frac{3a}{12} + \frac{4a - 8}{12} = \frac{7a - 8}{12}$

2.

$\frac{2x - y}{14} - \frac{x - y}{7} = \frac{2x - y}{14} - \frac{2x - 2y}{14} = \frac{2x - y - 2x + 2y}{14} = \frac{y}{14}$

3.

$\frac{x - 6}{2x} + \frac{7 - 2y}{4y} = \frac{2y \times (x - 6)}{4xy} + \frac{x \times (7 - 2y)}{4xy} = \frac{2xy - 12y + 7x - 2xy}{4xy} = \frac{ - 12y + 7x}{4xy}$

4.

$\frac{6m - n}{3n} - \frac{8n - 5m}{4n} = \frac{4 \times (6m - n)}{12n} - \frac{3 \times (8n - 5m)}{12n} = \frac{24m - 4n - 24n + 15m}{12n} = \frac{39m - 28n}{12n}$