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(1 i 1/2 - 1/4) / (1 i 1/2 - 3/8) = (1 i 1/4) / (1 i 1/8) = (5/4) / (9/8) = (5/4) * (8/9) = 10/9
b)
(1 i 1/2 + 1/4) / (-1/4 + 3/8) = (1 i 3/4) / (1/8) = (7/4) / (1/8) = (7/4) * 8 = 14
c)
(1 i 1/2 + 1/4 + 2*(-3/8)) / (1 i 1/2 - 1/4 + 3*(-3/8)) = (1 i 3/4 - 3/4) / (1 i 1/4 - 9/8) = 1/ ( 1 i 1/4 - 1 i 1/8) = 1 / (1/8) = 1 * 8 = 8