Odpowiedź:
4/7 * 0,3 = 4/7 * 3/10 = 12/70 = 6/35
2 i 1/4 : 0,1 = 2 i 1/4 : 1/10 = 9/4 * 10/1 = 90/4 = 22 i 2/4 = 22 i 1/2
0,4 : 3/4 = 4/10 * 4/3 = 16/30 = 8/15
