Odpowiedź:
Szczegółowe wyjaśnienie:
5.
Dorota Magda
2 * 3 1/5 = 2*3 + 2*1/5 = 2 * 3 1/5 = 2 * 16/5 = 32/5 = 6 2/5
= 6 + 2/5 = 6 2/5
4 * 3 5/7
4 * 3 5/7 = 4*3 + 4* 5/7 = 4 * 3 5/7 = 4 * 26/7 = 104/7 =
= 12 + 20/7 = 12 + 2 6/7 = = 14 6/7
= 14 6/7
6.
a) 3 * 6 2/3 = 3 * 20/3 = 60/3 = 20
b) 7 * 2 1/5 = 7 * 11/5 = 77/5 = 15 2/5
c) 1 5/7 *3 = 12/7 * 3 = 36/7 = 5 1/7
d) 5 1/3 *10 = 16/3 * 10 = 160/3 = 53 1/3
7.
Ilość = 7 * 1 1/3 = 7 * 4/3 = 28/3 = 9 1/3 l
8.
a) 7/8 * 16 = (7*16)/8 = (7*2)/1 = 14
b) 4/5 *15 = (4*15)/5 = (4*3)/1 = 12
c) 24 * 2/3 = (24*2)/3 = (8*2)/1 = 16
d) 4 * 3 7/8 = 4 * 31/8 = 31/2 = 15 1/2
e) 3 *2 5/6 = 3 * 17/6 = (3*17)/6 = 17/2 = 8 1/2
f) 8 * 4 1/4 = 8 * 17/4 = (8*17)/4 = 34
