Question

punctul g
dau coroana.

Answer 1

$g) \\ \\ ( \frac{2}{5} + \frac{1}{7} - \frac{1}{14}) \times 30 \frac{1}{3} = \frac{2 \times 14}{5 \times 14} + \frac{1 \times 10}{7 \times 10} - \frac{1 \times 5}{14 \times 5} = \frac{28}{70} + \frac{10}{70} - \frac{5}{70} = \frac{28 + 10 - 5}{70} = \frac{33}{70} \times 30 \frac{1}{3} = \frac{33}{70} \times \frac{30 \times 3 + 1}{3} = \frac{33}{70} \times \frac{90 + 1}{3} = \frac{33}{70} \times \frac{91}{3} = \frac{33 \times 91}{70 \times 3} = \frac{3003}{210} = \frac{143}{10} = 14 \frac{3}{10}$