1) 1) 4 5/12 - 3 7/18 = 4 15/36 - 3 14/36 = 1 1/36
2) 1 1/36 : 9,25 = 37/36 : 925/100 = 37/36 * 100/925 = 25/225 = 1/9
3) 1/9 + 5/6 = 2/18 + 15/18 = 17/18
4) 0,4+ 1/8 + 0,75 = 0,4+0,125+0,75=1,275
5) 1,275 * 2/3 = 1 275/100 * 2/3 = 375/100 * 2/3 = 125/50 = 2,5
6) 17/18 : 2,5 = 17/18 : 125/50 = 425/1125 = 85/225 = 17/45
2) 1) 3 7/15 * 0,25 = 52/15 * 25/100 = 65/75 = 13/15
2) 13/15 + 5/6 = 26/30 + 25/30 = 51/30 = 1 7/10
3) 1 7/10 - 1 2/5 = 1 7/10 - 1 4/10 = 3/10 = 0,3
4) 3/20 + 0,75 = 3/20 + 75/100 = 90/100 = 9/10 = 0,9
5) 5,4 : 0,9 = 6
6) 0,3 : 6 = 0,05