Ответ:

  1. \(0.7+\frac{1}{4}=\frac{7}{10}+\frac{1}{4}=\frac{14}{20}+\frac{5}{20}=\frac{19}{20}=0.95\).
  2. \(0.15-\frac{1}{5}=0.15-0.2=-0.05\).
  3. \(-6.5-\frac{1}{20}=-6.5-0.05=-6.55\).
  4. \(10-(-0.43)=10+0.43=10.43\).
  5. \(-2\frac{1}{5}-(-0.2)=-2.2+0.2=-2\).
  6. \(-2.4\cdot\frac{2}{3}=-\frac{24}{10}\cdot\frac{2}{3}=-1.6\).
  7. \(-0.8\cdot\left(-\frac{1}{6}\right)=\frac{0.8}{6}=\frac{2}{15}\).

Ответ: 1) 0,95; 2) −0,05; 3) −6,55; 4) 10,43; 5) −2; 6) −1,6; 7) \(\frac{2}{15}\).