The second one: 1.8 becomes 9/5, and then multiplied by 6/5, it is equal to 54/25, which is 54:25.
Third: 0.3 becomes 3/ 10, and then 3/2 times 10/3, which is equal to 5/ 1, that is, 5: 1.
simplify
The first one: 15/2 becomes 7.5, which is 270:7.5, and then 270 and 7.5 are multiplied by 10, which becomes 2700:75. When the two numbers are divided by 75 at the same time, it becomes 36: 1 after simplification.
The second one: 4.9 and 350 are multiplied by 10, respectively, to become 49:3500, and the two numbers are divided by 7 at the same time, which becomes 7:500 after simplification.
Third: change 26/3 into 3/26, multiply 13/2 by 3/26, 13/2 into 1/2, 3/26 into 3/2, and finally multiply 1/2 by 3/2 to get 3.