Ответ:

  1. \((22.5:0.45)(5.27+1.93)=50\cdot7.2=360\).
  2. \((7.6-8.5):(0.28+2.92)=-0.9:3.2=-\frac9{32}=-0.28125\).
  3. \(35.4(62.4-40.9)-12.5\cdot15.4=35.4\cdot21.5-192.5=761.1-192.5=568.6\).
  4. \(12.48:(1.28+1.17)-14.7:0.49=12.48:2.45-30=\frac{2496}{490}-30=-\frac{6204}{245}\).

Ответ: а) 360; б) −0,28125; в) 568,6; г) −6204/245.