Приведите дроби 3/1,1/2,3/5,3/10,9/20,2/25,9/50 к знаминателю 100,. Приведите дроби 2/3,1/2,3/4,1/6,4/15,7/20,11/30 к знаминателю

Приведем к знаменателю 100: 

3/1 = (3 * 100)/(1 * 100) = 300/100; 

1/2 = (1 * 50)/(2 * 50) = 50/100; 

3/5 = (3 * 20)/(5 * 20) = 60/100; 

3/10 = (3 * 10)/(10 * 10) = 30/100; 

9/20 = (9 * 5)/(20 * 5) = 45/100; 

2/25 = (2 * 4)/(25 * 4) = 8/100

9/50 = (9 * 2)/(50 * 2) = 18/100. 

Приведем к знаменателю 60: 

2/3 = (2 * 20)/(3 * 20) = 40/60; 

1/2 = (1 * 30)/(2 * 30) = 30/60; 

3/4 = (3 * 15)/(4 * 15) = 45/60; 

1/6 = (1 * 10)/(6 * 10) = 10/60; 

4/15 = (4 * 4)/(15 * 4) = 16/60; 

7/20 = (7 * 3)/(20 * 3) = 21/60; 

11/30 = (11 * 2)/(30 * 2) = 22/60.