((140*7/30-138*5/12):18*1/6)/0,002 = -114ц 157/162
Будем делать по действиям:
а). 140*7/30 = 140/1 * 7*30 = 14/1 * 7/3 = 98/3
б). 138*5/12 = 138/1 * 5/12 = 23/1 * 5/2 = 115/2
в). 98/3 - 115/2 = 196/6 - 345/6 = - 149/6
г). - 149/6 : 18 = - 149/6 * 1/18 = - 149/108
д). -149/108 * 1/6 = - 149/648
е). -149/648 : 0,002 = -149/648 : 2/1000 = -149/648 : 1/500 = -149/648 * 500/1 = - 149/162 * 125/1 = - 18625/162 = -114ц 157/162