1)2357 + х:718 = 2360
х:718 = 2360 - 2357
х:718 = 3
х = 718 * 3
х = 2154
2) (170*х):25 = 68
170 * х = 68 * 25
170 * х = 1700
х = 10
3) ( х +3912 ) -4542 =16208
х + 3912 = 16208 + 4542
х + 3912 = 20750
х = 20750 - 3912
х = 16838
4) 38120 -х :114=38114
х : 114 = 38120-38114
х: 114 = 6
х = 6 * 114
х = 684