6) \(4\frac{1}{5} : 0,3 \cdot 2\frac{1}{2} =\)
$$4\frac{1}{5} = \frac{4 \cdot 5 + 1}{5} = \frac{20 + 1}{5} = \frac{21}{5}$$
$$\frac{21}{5} : 0,3 = \frac{21}{5} : \frac{3}{10} = \frac{21}{5} \cdot \frac{10}{3} = \frac{21 \cdot 10}{5 \cdot 3} = \frac{7 \cdot 2}{1} = 14$$
$$2\frac{1}{2} = \frac{2 \cdot 2 + 1}{2} = \frac{4 + 1}{2} = \frac{5}{2}$$
$$14 \cdot \frac{5}{2} = \frac{14 \cdot 5}{2} = \frac{7 \cdot 5}{1} = 35$$
Ответ: 35