144х + 225 + 266 - 133х = 11х + 491
(10+7)*4=4*10+4*7=40+28=68
(2+30)*2=2*2+2*30=4+60=64
(23+7)*3=3*23+3*7=69+21=90
8+4=12 всего шаров
12-1=11 осталось
15.1
а) [3a] - [5a] - [4a] - [32a] - [16a]
б) [7x] - [3x] - [8x] - [4x] - [8x]
в) [8m] - [24m] - [30m] - [18m] - [9m]
г) [25y] - [5y] - [7y] - [y] - [13y]
15.2
а) [15y] - [22y] - [44y] - [y] - [8y]
б) [8b] - [3b] - [12b] - [36b] - [20b]
в) [c] - [15c] - [25c] - [5c] - [6c]
<span>г) [4d] - [12d] - [24d] - [15d] - [5d]</span>