Odpowiedź:
1.
2 * 5/7 = 10/7
A.
2 * 5/7 = 10/7 tak
B.
5/(2*7) = 5/14
C.
2 * 5/(2*7) = 10/14
D.
(2*7 + 5)/7 = (14 + 5)/7 = 21/7 = 3
2.
4/3 * 1/9 = 4/27
A.
36/4 = 9
B.
4/27 tak
C.
4/9
D.
4/12 = 1/3
3.
3/4
A.
-3/4
B.
0
C.
-4/3
D.
4/3
nie ma
4.
5 * 3/10 = 3/2 = 1 1/2
5.
a)
1 1/5 : 1/10 = 6/5 * 10 = 6 * 2 = 12
b)
1/10 : 1 1/5 = 1/10 : 6/5 = 1/10 * 5/6 = 1/2 * 1/6 = 1/12
6.
5/7 * x = 5/14 /*7/5
x = 5/14 * 7/5 = 1/2
7.
(3/4 - 1/3) : (1 + 1/4) = (9/12 - 4/12) : 1 1/4 = 5/12 : 5/4 = 5/12 * 4/5 = 1/3
Szczegółowe wyjaśnienie:
