Ответ:

  1. \(75-3.75=71.25\).
  2. \(0.48\cdot25=0.48\cdot100:4=12\).
  3. \(\frac{2}{3}-2=\frac{2}{3}-\frac{6}{3}=-\frac{4}{3}=-1\frac{1}{3}\).
  4. \(\frac{4}{7}:8=\frac{4}{7}\cdot\frac{1}{8}=\frac{1}{14}\).
  5. \(5\frac{1}{2}\cdot\frac{2}{11}=\frac{11}{2}\cdot\frac{2}{11}=1\).
  6. \(1\frac{1}{7}:\frac{1}{14}=\frac{8}{7}\cdot14=16\).
  7. \((-18):(-4.5)=4\).
  8. \((-10.5)\cdot0.4=-4.2\).

Ответ: 1) 71,25; 2) 12; 3) −1 1/3; 4) 1/14; 5) 1; 6) 16; 7) 4; 8) −4,2.