1.1
1)2 5/14 * 4 2/3 = 33/14 * 14/3 = 11
2)12 : 2 1/4 = 12/1 * 2/5 = 24/5 = 4 4/5
3) 11 - 5 1/4 = 11/1 - 21 /4 = 44/4 - 21/4 = 23/4 = 5 3/4
4) 5 3/4 + 4 4/5 = 5 15/20 + 4 16/20 = 9 31/20 = 10 11/20
5) 9 7/18 - 2 5 /9 = 9 7 / 18 - 2 10/18 = 169/18 - 46/18 = 123 /18
6/ 10 11/20 : 123/18 = 211/20 * 18/123 = 211/10 * 8/123= 1899/1230=633/410=1 223/410