Odpowiedź:
A
2 * 1 1/4 - 1/4 : 9 = 2 * 5/4 - 1/4 * 1/9 = 5/2 - 1/36 = 90/36 - 1/36 = 89/36 =
2 17/36
B
2 *( 1 1/4 - 1/4 : 9) = 2 * (5/4 - 1/4 * 1/9) = 2* (5/4 - 1/36) = 2 * (45/36 - 1/36) =
2 * 44/36 = 44/18 = 2 8/18 = 2 4/9
C
2 * (1 1/4 - 1/4) : 9 = 2 * (5/4 - 1/4) : 9 = 2 * 4/4 : 9 = 2 * 1 : 9 = 2 : 9 = 2/9
D
(2 * 1 1/4 - 1/4) : 9 = (2 * 5/4 - 1/4) :9 = (10/4 - 1/4) : 9 = 9/4 * 1/9 = 1/4
odp D
Szczegółowe wyjaśnienie:
