zadanie 1
a) 1 7/10 = 1,7
3/100 = 0,03
10/16 = 0,625
b) 0,25 = 25/100 = 1/4
3,4 = 3 4/10 = 3 2/5
7,8 = 7 8/10 = 7 4/5
zadanie 2
a) 4 2/5+0,15 = 4,4+0,15 = 4,55
b) 12 4/7-2,75 = 12 4/7-2 75/100 = 12 400/700-2 525/700 = 11 1100/700-2 525/700 = 9 575/1000 = 9 23/40
c) 3,8*3/19 = 3 8/10 * 3/19 = 38/10*3/19 = 3/10*3/1 = 9/10
d) 1 1/15:2,4 = 16/15:2 4/10 = 16/15:24/10 = 16/15*10/24 = 2/3*2/3 = 4/9
