Put the scores of the following groups in the order from big to small (1) 3 / 4, 9 / 7, 15 / 11, 12 / 5 (2) 1:30 13:1:8:5:1:4:3:6:11

Put the scores of the following groups in the order from big to small (1) 3 / 4, 9 / 7, 15 / 11, 12 / 5 (2) 1:30 13:1:8:5:1:4:3:6:11

If you want to compare the four numbers 3 / 4, 7 / 9, 11 / 15, 5 / 12, you only need to convert their denominators into the same value, then you can see at a glance who is big. The least common multiple of 4, 9, 15, 12 is 180, so the four numbers you mentioned earlier are 3 / 4 = 135 / 180; 7 / 9 = 140 / 180; 11 / 15 = 132 / 180; 5 / 1