Odpowiedź:
a)
2c : 8 = 1 1/2
2/8c = 3/2
1/4c = 3/2 /*4
c = 3/2 * 4 = 6
3d : 2 = 2 1/4
3/2d = 9/4 /*2/3
d = 9/4 * 2/3 = 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
c)
1 2/3 - 5c = 1 1/4
-5c = 1 1/4 - 1 2/3 /:(-5)
x = -(1 3/12 - 1 8/12)/5 = 5/12 * 1/5 = 1/12
1/2p : 1 3/4 = 8
1/2p : 7/4 = 8
1/2p * 4/7 = 8
2/7p = 8 /*7/2
p = 8 * 7/2 = 28
Szczegółowe wyjaśnienie:
