Odpowiedź:
1 1/5 - 1/2 + 3/4 + 3/10 = 1 2/10 + 3/10 - 2/4 + 3/4 = 1 5/10 + 1/4 = 1 1/2 + 1/4 =
= 1 2/4 + 1/4 = 1 3/4
(2 1/4 - 1 2/3) : (1/6 + 2/9) = (2 3/12 - 1 8/12) : (3/18 + 4/18) = (1 15/12 - 1 8/12) : 7/18 = 7/12 * 18/7 = 3/2 = 1 1/2
5/7 x 1 3/4 - (1/2)² = 5/7 * 7/4 - 1/4 = 5/4 - 1/4 = 4/4 = 1
Szczegółowe wyjaśnienie: