irinaorlova2 1)1 1\6:1 5\9=7\6*9\14=3\4
2)3 1\4+3\4=4
3)4:2 2\7=4*7\16=7\4=1 3\4
4)5 1\9:7 2\3=46\9*3\23=2\3
5)1 3\4+2\3=1+9\12+8\12=1+17\12=2 5\12

niktory (3 1/4 + 1 1/6 : 1 5/9) : 2 2/7 + 5 1/9 = 2 5/12
1) 1 1/6 : 1 5/9 = 7/6 : 14/9 = 7/6 * 9/14 = (7*9)/(6*14) = (1*3)/(2*2) = 3/4
2) 3 1/4 + 3/4 = 3 4/4 = 4
3) 4 : 2 2/7 = 4 : 16/7 = 4 * 7/16 = (4*7)/16 = 7/4 = 1 3/4
4) 5 1/9 : 7 2/3 = 46/9 : 23/3 = 46/9 * 3/23 = 2/3
5) 1 3/4 + 2/3 = 1 9/12 + 8/12 = 1 17/12 = 2 5/12