Ж) $$(0,014·1\frac{2}{3}-0,286:(-0,6)):(-0,025)$$

Ж) Выполним действия:

1) $$1\frac{2}{3} = \frac{1 \cdot 3 + 2}{3} = \frac{5}{3}$$

2) $$0,014 \cdot \frac{5}{3} = \frac{14}{1000} \cdot \frac{5}{3} = \frac{7}{500} \cdot \frac{5}{3} = \frac{7}{100} \cdot \frac{1}{3} = \frac{7}{300}$$

3) $$-0,6 = -\frac{6}{10} = -\frac{3}{5}$$

4) $$0,286 : \left(-\frac{3}{5}\right) = \frac{286}{1000} : \left(-\frac{3}{5}\right) = \frac{143}{500} \cdot \left(-\frac{5}{3}\right) = \frac{143}{100} \cdot \left(-\frac{1}{3}\right) = -\frac{143}{300}$$

5) $$\frac{7}{300} - \left(-\frac{143}{300}\right) = \frac{7}{300} + \frac{143}{300} = \frac{150}{300} = \frac{1}{2}$$

6) $$-0,025 = -\frac{25}{1000} = -\frac{1}{40}$$

7) $$\frac{1}{2} : \left(-\frac{1}{40}\right) = \frac{1}{2} \cdot (-40) = -20$$

Ответ: -20