Odpowiedź:
a)
2c : 8 = 1 1/2 /*8
2c = 3/2 * 8 /:2
c = 3/4 * 1/2 = 3/8
3d : 2 = 2 1/4 /*2
3d = 9/4 * 2 /:3
d = 9/2 * 1/3 = 3/2 = 1 1/2
b)
3 3/4 * 2x = 30
15/4 * 2x = 30
15/2x = 30 /*2/15
x = 30 * 2/15 = 4
3a + 1 3/4 = 2 1/5
3a = 2 1/5 - 1 3/4 /:3
a = (2 4/20 - 1 15/20)/3 = (1 24/20 - 1 15/20) : 3 = 9/20 * 1/3 = 3/20
Szczegółowe wyjaśnienie:
