3200 : 5 = 3200 * 2 / 10 = 6400 / 10 = 640,
2350 : 50 = 2350 * 2 / 100 = 4700 / 100 = 47,
1320 : 5 = 1320 * 2 / 10 = 2640 / 10 = 264,
7200 : 50 = 7200 * 2 / 100 = 14400 / 100 = 144,
4320 : 5 = 4320 * 2 / 10 = 8640 / 10 = 864,
9200 : 50 = 9200 * 2 / 100 = 18400 / 100 = 184
2445.85;1968.99;не понял примеры
0,66:13,2=0,05; 0,05+8,74=8,79; 8,79-3,79=5; 5•0,31=1,55
1/30+(3*6-1*5)/30=1/30+13/30=14/30=7/15