Пошаговое объяснение:

4,23(6) = 4 (236-23)/900 = 4 213/900 = 4 71/300

4,23(6) + 29/300 = 4 71/300 + 29/300 = 4 100/300 = 4 1/3

3,16(54) = 3 (1654-16)/9900 = 3 1638/9900 = 3 91/550

3,16(54) - 18/275 = 3 91/550 - 18/275 = 3 91/550 - 36/550 = 3 55/550 = 3 1/10