Odpowiedź :
Człowieku przecież to banalne
a-2(b-1)+2[-5(a+1)-0,5a]+2b przy a=4/5 b=1/4:
4/5-2(1/4-1)+2[-5(4/5+1)-0,5*4/5]+2*1/4
4/5-2(-3/4)+2[-5(9/5)-2/5]+2/4
4/5+6/4+2[-45/5-2/5]+2/4
16/20+30/20+2[-47/5]+2/4
46/20-94/5+2/4
46/20-376/20+10/20
-320/20 = -16
a-2(b-1)+2[-5(a+1)-0,5a]+2b przy a=4/5 b=1/4:
4/5-2(1/4-1)+2[-5(4/5+1)-0,5*4/5]+2*1/4
4/5-2(-3/4)+2[-5(9/5)-2/5]+2/4
4/5+6/4+2[-45/5-2/5]+2/4
16/20+30/20+2[-47/5]+2/4
46/20-94/5+2/4
46/20-376/20+10/20
-320/20 = -16
a-2(b-1)+2[-5(a+1)-0,5a]+2b
a=4/5 b=1/4
4/5-2(1/4-1)+2[-5(4/5+1)-0,5*4/5]+2*1/4=
=4/5-2*(-3/4)+2[-5*(9/5)-4/10]+2/4=
=4/5-(-6/4)+2[-45/5-4/10]+2/4=
=16/20+30/20+2[-9-8/20]+10/20=
=46/20+2[-188/20]+10/20=
=56/20-376/20=
=-320/20=
=-16
a=4/5 b=1/4
4/5-2(1/4-1)+2[-5(4/5+1)-0,5*4/5]+2*1/4=
=4/5-2*(-3/4)+2[-5*(9/5)-4/10]+2/4=
=4/5-(-6/4)+2[-45/5-4/10]+2/4=
=16/20+30/20+2[-9-8/20]+10/20=
=46/20+2[-188/20]+10/20=
=56/20-376/20=
=-320/20=
=-16