1) 478-(256+x) = 14478 - 256 - x = 14222 - x = 14-x = 143 - 22-x = -7x = 79
Ответ: x = 79
2) 659-(345-x) = 42659 - 345 + x = 42314 + x = 42x = 427 - 31x = 113
Ответ: x = 113
3) 791-(x-298) = 68791 - x + 298 = 681089 - x = 68-x = 683 - 108-x = -40x = 406
Ответ: x = 406
1) 478-(256+x) = 14
478 - 256 - x = 14
222 - x = 14
-x = 143 - 22
-x = -7
x = 79
Ответ: x = 79
2) 659-(345-x) = 42
659 - 345 + x = 42
314 + x = 42
x = 427 - 31
x = 113
Ответ: x = 113
3) 791-(x-298) = 68
791 - x + 298 = 68
1089 - x = 68
-x = 683 - 108
-x = -40
x = 406
Ответ: x = 406