Ответ:

Сокращаем каждую дробь, разделив числитель и знаменатель на их НОД.

а)

  1. НОД(30, 66) = 6: 30/66 = 5/11.
  2. НОД(60, 100) = 20: 60/100 = 3/5.
  3. НОД(15, 20) = 5: 15/20 = 3/4.
  4. НОД(24, 40) = 8: 24/40 = 3/5.
  5. НОД(75, 100) = 25: 75/100 = 3/4.

б)

  1. НОД(27, 54) = 27: 27/54 = 1/2.
  2. НОД(125, 1000) = 125: 125/1000 = 1/8.
  3. НОД(21, 35) = 7: 21/35 = 3/5.
  4. НОД(45, 120) = 15: 45/120 = 3/8.
  5. НОД(400, 1000) = 200: 400/1000 = 2/5.

в)

  1. НОД(36, 84) = 12: 36/84 = 3/7.
  2. НОД(250, 1000) = 250: 250/1000 = 1/4.
  3. НОД(22, 33) = 11: 22/33 = 2/3.
  4. НОД(72, 96) = 24: 72/96 = 3/4.
  5. НОД(225, 1000) = 25: 225/1000 = 9/40.