Odpowiedź:
2 i 1/2 * (0,3 + 4/5 : 4) = 2 i 1/2 * (0,3 + 4/5 * 1/4) = 2 i 1/2 *(0,3 + 1/5) = 2 i 1/2 * (0,3 + 0,2) = 2 i 1/2 * 0,5 = 5/2 * 5/10 = 25/20 = 1 i 5/20 = 1 i 1/4
(1/5 + 2/3) * (6 i 2/5 - 4/9) = ( 3/15 + 10/15) * (6 i 18/45 - 20/45) = 13/15 * ( 5 i 63/45 - 20/45) = 13/15 * 5 i 43/45 = 13/15 * 268/45 = 3484/675 = 5 i 109/675