Ответ:

  1. \((9.5+8.9):2.3=18.4:2.3=8\).
  2. \(1.2:(6.7-7.3)=1.2:(-0.6)=-2\).
  3. \(18:(2.5\cdot2.4)=18:6=3\).
  4. \((2.8\cdot0.3):0.7=0.84:0.7=1.2\).
  5. \(-4\cdot(-6.2)-8.4=24.8-8.4=16.4\).
  6. \(0.9:\left(1+\frac15\right)=0.9:\frac65=0.75\).

Ответ: 1) 8; 2) −2; 3) 3; 4) 1,2; 5) 16,4; 6) 0,75.