Ответ:

  1. 50% = 50/100 = 1/2.

  2. 25% = 25/100 = 1/4.

  3. 10% = 10/100 = 1/10.

  4. 20% = 20/100 = 1/5.

  5. 80% = 80/100 = 4/5.

  6. 75% = 75/100 = 3/4.

Ответ: 1) 1/2; 2) 1/4; 3) 1/10; 4) 1/5; 5) 4/5; 6) 3/4.