Приведите дроби: 1) 1/2, 3/4, 4/5, 9/10 к знаменателю 20; 2) 3/4,1/6,7/18,8/9 к знаменателю 36; 3) 1/2,2/4,3/8,5/32 к знаменателю 64,4) 1/5,1/4,7/25,63/50 к знаменателю 100

Приведем дроби к указанным знаменателям:

1) 1/2 = (1 * 10) / (2 * 10) = 10/20;

3/4 = (3 * 5) / (4 * 5) = 15/20;

4/5 = (4 * 4) / (5 * 4) = 16/20;

9/10 = (9 * 2) / (10 * 2) = 18/20.

2) 3/4 = (3 * 9) / (4 * 9) = 27/36;

1/6 = (1 * 6) / (6 * 6) = 6/36;

7/18 = (7 * 2) / (18 * 2) = 14/36;

8/9 = (8 * 4) / (9 * 4) = 32/36.

3) 1/2 = (1 * 32) / (2 * 32) = 32/64;

2/4 = (2 * 16) / (4 * 16) = 32/64;

3/8 = (3 * 8) / (8 * 8) = 24/64;

5/32 = (5 * 2) / (32 * 2) = 10/64.

4) 1/5 = (1 * 20) / (5 * 20) = 20/100;

1/4 = (1 * 25) / (4 * 25) = 25/100;

7/25 = (7 * 4) / (25 * 4) = 28/100;

63/50 = (63 * 2) / (50 * 2) = 126/100.