Odpowiedź :
|2ab-c│: 4a²c+b dla a=1/2 b=-2 c=-1
(2*1/2)-(-1) : 4*(1/2)²*(-1)+(-2)=
=1+1:(4*1/4)*(-1)-2=
=2:1*(-1)-2=
=2:-1-2=
=2:-3 = -2/3
(2*1/2)-(-1) : 4*(1/2)²*(-1)+(-2)=
=1+1:(4*1/4)*(-1)-2=
=2:1*(-1)-2=
=2:-1-2=
=2:-3 = -2/3