А) 2/3 + 1/4 б) 4/5 - 3/4 в)1/2 -1/3 г)5/6 + 3/8

А ) 2 / 3 + 1 / 4 = ( 2 * 4 + 1 * 3) / 12 = ( 8 + 1 * 3 ) / 12 = ( 8 + 3 ) / 12 = 11 / 12 б ) 4 / 5 - 3 / 4 = ( 4 * 4 - 3 * 5 ) / 20 = ( 16 - 3 * 5 ) / 20 = ( 16 - 15 ) / 20 = 1 / 20 в ) 1 / 2 - 1 / 3 = ( 1 * 3 - 1 * 2 ) / 6 = ( 3 - 1 * 2 ) / 6 = ( 3 - 2 ) / 6 = 1 / 6 г ) 5 / 6 + 3 / 8 = (5 * 4 + 3 * 3 ) / 24 = ( 20 + 3 * 3 ) / 24 = ( 20 + 9 ) / 24 = 29 / 24 = 1 целая 5 / 24 ответ : а 0 11 / 12 б ) 1 / 20 в ) 1 / 6 г ) 29 / 24 = 1 целая 5 / 24