4. Вычислите: 1) 1-5,71+1-2,51 – 14,321; 2) 2) \(\frac{5}{42}\) : 1-\(\frac{2}{3}\).

1) \(-5.71 + (-2.51) - 14.32 = -5.71 - 2.51 - 14.32 = -22.54\) 2) \(\frac{5}{42} : (1 - 1\frac{2}{3}) = \frac{5}{42} : (\frac{3}{3} - \frac{5}{3}) = \frac{5}{42} : (-\frac{2}{3}) = \frac{5}{42} \cdot (-\frac{3}{2}) = -\frac{5 \cdot 3}{42 \cdot 2} = -\frac{15}{84} = -\frac{5}{28}\)