4. Oblicz
a) 1 i 2/5 + 1/3
b) 2 i 3/8 - 5/7
c) 1 i 3/5 * 5/8
d) 2 i 1/3 : 1 i 5/6



4 Oblicz A 1 I 25 13 B 2 I 38 57 C 1 I 35 58 D 2 I 13 1 I 56 class=