1/3 и 2/3 5/12 и 7/12 1/2 и 3/4 7/10 и 7/2 4/15 и 4/19 4/12 и 10/30 7/9 и 7/19 12/13 и 12/11 11/12 и 1 11/12 3 и 3 1/2 1/2 и 9/10 3 5/6 и 3 5/4 19/11 и 19/57 1 3/4 21/20 и 21/19 3 4/17 и 4 4/17 2 и 2 1/2 78/77 и 78/75 1/323 и 1/421 4 и 52/13 сравнить дроби пожплуста

1) 1/3 < 2/3 2) 5/12 < 7/12 3) 1/2 < 3/4, т.к. 2/4 < 3/4 4) 7/10 < 7/2, т.к. 7/10 < 35/10 5) 4/15 > 4/19, т.к. 76/285 > 60/285 6) 4/12 = 10/30, т.к. 20/60 = 20/60 7) 7/9 > 7/19, т.к. 133/171 > 63/171 8) 12/13 < 12/11, т.к. 121/143 < 156/143 9) 11/12 < 1 11/12 10) 3 < 3 1/2 11) 1/2 < 9/10, т.к. 5/10 < 9/10 12) 3 5/6 < 3 5/4, т.к. 23/6 < 17/4 = 46/12 < 51/12 13) 19/11 > 19/57, т.к. 1083/627 > 209/627 14) 21/20 < 21/19, т.к. 399/380 < 420/380 15) 3 4/17 < 4 4/17 16) 2 < 2 1/2 17) 78/77 < 78/75, т.к. 5850/5775 < 6006/5775 18) 1/323 > 1/421, т.к. 421/135983 > 323/135983 19) 4 = 52/13, т.к. 4 = 4.