-1i 2/5-4 i3/4= -6 i3/8+3i 5/6= -4i2/7+2i9/14= 4i3/11-8=

a) -1i 2/5-4 i3/4= - 1,4 - 4,75 = - 6,15 b) -6 i3/8+3i 5/6= - 51/8 + 23/6 = - 306/48 + 184/48 = - 122/48 = -2 ¹³/₂₄ c) -4i2/7+2i9/14= -30/7 + 37/14 = - 60/14 + 37/14 = - 23/14 = - 1⁹/₁₄ d) 4i3/11-8= 47/11 - 8 = 47/11 - 88/11 = - 41/11 = - 3 ⁸/₁₁