Question

Oblicz.
A. (2,5-1 i 1/4):5/12=
B.(0,825-0,7): (2 i 5/7-2 i 8/21)=
C. [(2 i 1/5+2/5):1/2-3 i 1/5]*3/2

Answer 1

A.)
(2,5 - 1i1/4) : 5/12 = (2i1/2 - 5/4) : 5/12 = (5/2 - 5/4) : 5/12 = (10/4 - 5/4) : 5/12 = 5/4 * 12/5 = 60/20 = 3

b.)
(0,825-0,7) : (2i5/7 - 2i8/21) = 0,125 : (19/7 - 50/21) = 1/8 : (57/21 - 50/21) = 1/8 : 7/21 = 1/8 : 1/3 = 1/8 * 3/1 = 3/8

c.)
[(2 i 1/5 + 2/5) : 1/2 - 3i1/5] * 3/2 = [(11/5 + 2/5) : 1/2 - 16/5] * 3/2 = [(13/5) : 5/10 - 32/10] * 3/2 = [13/5 : (-27/10)] * 3/2 = [13/5 * (-10/27)] * 3/2 = (-130/135) * 3/2 = (-26/27) * 3/2 = -78/54 = -1 i 24/54

nie jestem pewna przykładu c