12. Oblicz:
a) 3 1/4 - 5/8 = 2 5/4 - 3/4 = ......
b) 5 5/8 - 7/8 = ...................................
c) 7 3/5 - 4/5 = ...................................
d) 5 1/4 - 2 3/4 =.................................
e) 7 1/5 - 3 3/5 =.................................
f) 9 1/8 - 2 7/8 =..................................
Szybka odp