Вариант 3. Вычислите: 1) 0.6 + 1/3; 2) 3/5 − 0.85; 3) −2.5 − 1/4; 4) −8 − (−0.56); 5) 1 1/2 − (−0.5); 6) −1.4 · 3/7; 7) −0.9 · (−4/5); 8) −10 : (−1/5); 9) −1 4/15 : 19; 10) −0.25 : (−0.005).

1. \(0.6+\frac{1}{3}=\frac{3}{5}+\frac{1}{3}=\frac{9+5}{15}=\frac{14}{15}\).
2. \(\frac{3}{5}-0.85=0.6-0.85=-0.25\).
3. \(-2.5-\frac{1}{4}=-2.5-0.25=-2.75\).
4. \(-8-(-0.56)=-8+0.56=-7.44\).
5. \(1\frac{1}{2}-(-0.5)=1.5+0.5=2\).
6. \(-1.4\cdot\frac{3}{7}=-0.6\).
7. \(-0.9\cdot\left(-\frac{4}{5}\right)=0.9\cdot0.8=0.72\).
8. \(-10:\left(-\frac{1}{5}\right)=(-10)\cdot(-5)=50\).
9. \(-1\frac{4}{15}:19=-\frac{19}{15}:19=-\frac{19}{15}\cdot\frac{1}{19}=-\frac{1}{15}\).
10. \(-0.25:(-0.005)=50\).

Ответ: 1) \(\frac{14}{15}\); 2) −0.25; 3) −2.75; 4) −7.44; 5) 2; 6) −0.6; 7) 0.72; 8) 50; 9) \(−\frac{1}{15}\); 10) 50.