а) (30-2) x 5 = 28 x 5 = 140б) 7 x (60-2) = 7 x 58 = 406в) 85 x 137 - 75 x 137 = 11645 - 10275 = 1370г) 78 x 214 - 78 x 204 = 16732 - 15912 = 820
а) (30-2) x 5 = 28 x 5 = 140
б) 7 x (60-2) = 7 x 58 = 406
в) 85 x 137 - 75 x 137 = 11645 - 10275 = 1370
г) 78 x 214 - 78 x 204 = 16732 - 15912 = 820