1) 3/4 = 3*5/4*5=15/20 .
2) 2/3 = 2*5/3*5= 10/15.
3) 2/7 и 8/21 = 6/21 и 8/21.
4)5/12 и 11/18 = 15/36 и 22/36.
5) 5/8 и 11/24 = 15/24 и 11/24.
6) 4/9 и 7/15 = 20/45 и 21/45.
1) 3/4 = 3*5/4*5=15/20 .
2) 2/3 = 2*5/3*5= 10/15.
3) 2/7 и 8/21 = 6/21 и 8/21.
4)5/12 и 11/18 = 15/36 и 22/36.
5) 5/8 и 11/24 = 15/24 и 11/24.
6) 4/9 и 7/15 = 20/45 и 21/45.