46. 1) 1/3 : 6 = 1:18
1*6 = 6*1/3
6=6
2) 7 : 3 1/2 = 9 : 9/2
3 1/2 * 9 = 9/2 * 7
7/2 * 9 = 9/2 * 7
63/2 = 63/2
31 1/2 - 31 1/2
49. 1) 2/3 : 4/5 = 10 : 12
2/3 * 12 = 4/5 * 10
8 = 8
2) 3/7 : 4/9 = 27 : 28
3/7 * 28 = 4/9 * 27
12 = 12
3) 4/11 : 5/6 = 48 : 110
4/11 * 110 = 5/6 * 48
40 = 40
4) 1/2 : 2/3 = 4 : 3
1/2 * 3 = 2/3 * 4
3/2 ≠ 8/3