\( 78 = 60 + 18 \)
\( 78:6 = (60 + 18):6 = 60:6 + 18:6 = 10 + 3 = 13 \)
\( 84 = 60 + 24 \)
\( 84:3 = (60 + 24):3 = 60:3 + 24:3 = 20 + 8 = 28 \)
\( 848 = 800 + 48 \)
\( 848:4 = (800 + 48):4 = 800:4 + 48:4 = 200 + 12 = 212 \)
\( 905 = 900 + 5 \)
\( 905:5 = (900 + 5):5 = 900:5 + 5:5 = 180 + 1 = 181 \)
Ответ: 78:6 = 13; 84:3 = 28; 848:4 = 212; 905:5 = 181.