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b) [ 15 i 2/3 + (- 7 i 1/2) ] : 7/6 = ( 47/3 - 15/2 ) : 7/6 = ( 94/6 - 45/6) : 7/6 =
= 49/6 * 6/7 = 294/42 = 7
c) 2/3 - 1/2 + 2 i 1/10 : 1 i 2/5 = 2/3 - 1/2 + 21/10 : 7/5 = 2/3 - 1/2 + 21/10 * 5/7 =
= 2/3 - 1/2 + 105/70 = 2/3 - 1/2 + 21/14 = 2/3 - 1/2 + 3/2 = 4/6 - 3/6 + 9/6 = 10/6 = 1 i 4/6 = 1 i 2/3