Приведите дроби к одному из знаменателей 10 или 100 и запишите соответствующие десятичные дроби: а) 1/2,1/4,1/5,1/20,1/25,1/50; б) 3/4,2/5,3/20,2/25,3/50; в) 2 1/2,3 1/4,1 7/20,4 4/25; г) 3/2,9/4,63/20,51/25.

а) 1/2 = (1 * 5) / (2 * 5) = 5/10;

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

1/5 = (1 * 2) / (5 * 2) = 2/10;

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

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

1/50 = (1 * 2) / (50 * 2) = 2/100.

б) 3/4 = (3 * 25) / (4 * 25) = 75/100;

2/5 = (2 * 2) / (5 * 2) = 4/10;

3/20 = (3 * 5) / (20 * 5) = 15/100;

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

3/50 = (3 * 2) / (50 * 2) = 6/100.

в) 2 1/2 = 5/2 = (5 * 5) / (2 * 5) = 25/10;

3 1/4 = 13/4 = (13 * 25) / (4 * 25) = 325/100;

1 7/20 = 27/20 = (27 * 5) / (20 * 5) = 135/100;

4 4/25 = 104/25 = (104 * 4) / (25 * 4) = 416/100.

г) 3/2 = (3 * 5) / (2 * 5) = 15/10;

9/4 = (9 * 25) / (4 * 25) = 225/100;

63/20 = (63 * 5) / (20 * 5) = 315/100;

51/25 = (51 * 4) / (25 * 4) = 204/100.