Rozwiąż: a)-2,5*4i12-5i1720:(-0,9)= b)[1,2:(-35)-1i13*(-0,3)]:1i17=

a)-2,5*4i12-5i1720:(-0,9)= -5/2*9/2-117/20*(-10/9)= -45/4+117/18=-405/36+234/36=-171/36=-4 i 3/4=-4,75 b)[1,2:(-35)-1i13*(-0,3)]:1i17= [6/5*(-5/3)-4/3*(-3/10)]:8/7= =(-2+2/5)*7/8= -12/5*7/8=-21/10=-2,1