Помогите пж с математикой

66 1/21 - 27 4/9 = 65 21 + 1/21 - 27 4/9 = 65 22/21 - 27 4/9 = 65 22 * 3/21 * 3 - 27 4 * 7/ 9 * 7 = 65 66/63 - 27 28/63 = ( 65 - 27 ) + ( 66/63 - 28/63 ) = 38 + 38/63 = 38 38/63

Ответ: 38 38/63.