780:23 12081:63 654650:320.

Решение:

а) 780:23 = 780/23 = (759+21) / 23 = 759/23+21/23 = 33 + (21/23)

б) 12081:63 = 12081/63 = (12033+48) / 63 = 12033/63+48/63 = 191 + (48/63) = 191 + (16/21)

в) 654650:320=65465/32 = (65440+25) / 32=2045 + (25/32)