60. Найдите значение выражения: a) $$\left(15-9\frac{1}{3}:\frac{2}{3}\right)-\frac{9}{71} \cdot (-8,45)$$; б) $$\frac{(11,81 + 8,19) - 0,02 + 3,35}{9:11,25}$$

• a) $$\left(15-9\frac{1}{3}:\frac{2}{3}\right)-\frac{9}{71} \cdot (-8,45)$$ = $$\left(15-\frac{28}{3}:\frac{2}{3}\right)+\frac{9}{71} \cdot 8,45$$ = $$\left(15-\frac{28}{3} \cdot \frac{3}{2}\right)+\frac{9}{71} \cdot 8,45 = (15 - 14) + \frac{9}{71} \cdot 8,45 = 1 + \frac{9 \cdot 8,45}{71} = 1 + \frac{76,05}{71} = 1 + 1,071 = 2,071$$
• б) $$\frac{(11,81 + 8,19) - 0,02 + 3,35}{9:11,25} = \frac{20 - 0,02 + 3,35}{9:11,25} = \frac{23,33}{9:11,25} = \frac{23,33}{9 \cdot \frac{4}{45}} = \frac{23,33}{3,6:4,5} = \frac{23,33}{0,8} = 29,1625$$

Ответ: a) 2,071; б) 29,1625