2. Выполните действия a) $$1\frac{5}{19} \cdot (6 - 3\frac{5}{8})$$ б) (6,3:1,4-2,05)\cdot1,8

a) $$1\frac{5}{19} \cdot (6 - 3\frac{5}{8})$$

1. $$6 - 3\frac{5}{8} = 6 - \frac{29}{8} = \frac{48 - 29}{8} = \frac{19}{8}$$
2. $$1\frac{5}{19} \cdot \frac{19}{8} = \frac{24}{19} \cdot \frac{19}{8} = \frac{3 \cdot 8 \cdot 19}{19 \cdot 8} = 3$$

б) (6,3:1,4-2,05)⋅1,8

1. $$6,3 : 1,4 = 63 : 14 = \frac{63}{14} = \frac{9}{2} = 4,5$$
2. $$4,5 - 2,05 = 2,45$$
3. $$2,45 \cdot 1,8 = 4,41$$

Ответ: а) 3; б) 4,41