2 1/2 - 1 3/4 = 5 + 7 8/9 + 4 1/2 = 2 2/3 * 3 3/4 = 2/3 : 5/12 = 1 1/2 : 3/4 = 2/5 : 2 1/2 = 3 : 2 1/4 = ułamki ;p

2 1/2-1 3/4=2 2/4-1/3/4=1 6/4-1 3/4= 3/4   5+7 8/9+4 1/2= 5+7 16/18+4 9/18=16 25/18= 17 7/25   2 2/3*3 3/4= 8/3*15/4=10   2/3:5/12=2/3*12/5=8/5=1 3/5   1 1/2: 3/4= 3/2:3/4= 3/2*4/3=2   2/5 : 2 1/2= 2/5 :5/2= 2/5*2/5=4/25   3:2 1/4= 3:9/4=3*4/9=4/3=1 1/3