Odpowiedź:
5 i 1/2 * (1,5)² - 4 i 5/7 : 1 i 1/21 = 11/2 * 2,25 - 33/7 : 22/21 = 11/2 * 5/4 - 33/7 : 22/21 = 55/8 - 33/7 * 21/22 = 55/8 - 9/2 = 46/16 = 2 i 14/16 = 2 i 7/8
11 i 1/4 * (1 i 2/3 - 1 i 19/21 * 0,7) = 11 i 1/4 * (1 i 2/3 - 40/21 * 7/10) = 11 i 1/4 * (1 i 2/3 - 4/3) = 45/4 * (5/3 - 4/3) = 45/4 * 1/3 = 45/12 = 3 i 9/12 - 3 i 3/4
3 i 1/3 + 2,25 : 3 i 1/3 - 1,25 = 3 i 1/3 + 2 i 1/4 : 3 i 1/3 - 1 i 1/4 = 3 i 1/3 + 9/4 : 10/3 - 1 i 1/4 = 3 i 1/3 + 27/40 - 1 i 1/4 = 3 i 121/120 - 1 i 30/120 = 2 i 91/120
