Question

помогите пожалуйста
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Answer 1

Ответ:

$\frac{1}{2} + \frac{1}{4} = \frac{2 \times 1 + 1}{4} = \frac{2 + 1}{4} = \frac{3}{4}$

$\frac{1}{4} - \frac{1}{2} = \frac{1 - 2 \times 1}{4} = \frac{1 - 2}{4} = - \frac{1}{4}$

$\frac{2}{5} + 4 = \frac{2 + 4 \times 5}{5} = \frac{2 + 20}{5} = \frac{22}{5} = 4 \frac{2}{5}$

$\frac{2}{5} - 3 = \frac{2 - 3 \times 5}{5} = \frac{2 - 15}{5} = - \frac{13}{5} = - 2 \frac{3}{5}$

$5 - \frac{2}{3} = \frac{5 \times 3 - 2}{3} = \frac{15 - 2}{3} = \frac{13}{3} = 4 \frac{1}{3}$