2,75:1/2:2-4[2-(-2+1/2):2]-2

2,75:1/2:2-4[2-(-2+1/2):2]-2 = 11/4*2/1*1/2-4[2-(-3/2*1/2)]-2= 11/4-4*2i1/4-2= 11/4-4*9/4-2= 11/4-9-2=2i3/4-11=8,25

2,75:1/2:2-4[2-(-2+1/2):2]-2 = 2,75*2:2-4[2-(-3/2):2]-2=2,75-4[2+3/4]-2=2,75-4*11/4-2=2,75-11-2=-10,25