1) 1,2,3,4,
2)1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18
33/9 / 11/17=33/9 * 17/11=51/9, или 5 2/3
6а-2а=4а
8с+4с-с=11с
4м-6м-3м+7+м=-4м+7
А(567 + 7843 =8410
2415 - 7843 = 10258
б) 88942 - 44701 =44241
88942 -17942 =71000
в)(830+243)-647=399
(1712+805)-647=1870