1. Найдите значение выражения.
а) $$6 \frac{7}{12} + (5 \frac{3}{40} + 4 \frac{8}{15})$$
- $$5 \frac{3}{40} + 4 \frac{8}{15} = 5 \frac{9}{120} + 4 \frac{64}{120} = 9 \frac{73}{120}$$
- $$6 \frac{7}{12} + 9 \frac{73}{120} = 6 \frac{70}{120} + 9 \frac{73}{120} = 15 \frac{143}{120} = 16 \frac{23}{120}$$
б) $$5 \frac{2}{3} : \frac{1}{3} - \frac{1}{12} \times 6$$
- $$5 \frac{2}{3} : \frac{1}{3} = \frac{17}{3} : \frac{1}{3} = \frac{17}{3} \times \frac{3}{1} = 17$$
- $$\frac{1}{12} \times 6 = \frac{6}{12} = \frac{1}{2}$$
- $$17 - \frac{1}{2} = 16 \frac{1}{2}$$
Ответ: а) $$16 \frac{23}{120}$$; б) $$16 \frac{1}{2}$$