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2/5 и 1/20=8/20 и 1/20
7/12 и 5/24=14/24 и 5/24
2/3 и 3/4= 8/12 и 9/12
1/7 и 5/8 = 8/56 и 35/56
2/11 и 3/10= 20/110и 33/110
2/3 и 4 /27 =18/27 и 4/27
1/2 и 1/3 = 3/6 и 2/6
1/2 и 1/7 = 7/14 и 2/14
2/15 и 3/16 = 32/240 и 45/240
3/10 и 4/17 = 51/170 и 40/170
9/3 и 4 /11= 99/33 и 12/33
2/9 и 3/8=16/72 и 27/72