Ответ:

  1. \(\frac12x-y=\frac12\cdot2.4-0.8=1.2-0.8=0.4\).
  2. \(\frac12x-y=\frac12\cdot(-3.6)-5=-1.8-5=-6.8\).
  3. \(\frac12x-y=\frac12\cdot4.8-(-2.1)=2.4+2.1=4.5\).
  4. \(\frac12x-y=\frac12\cdot(-4.4)-(-3)=-2.2+3=0.8\).

Ответ: а) \(0,4\); б) \(-6,8\); в) \(4,5\); г) \(0,8\).