Решите уравнения 486:(5х+2)=18 5(14+b)+6b=158
5х+2=486:18 5х+2=27 5х=27-2 5х=25 х=25:5 х=5 70+5b+6b=158 11b=158-70 11b=88 b=88:8 b=8
486 : ( 5Х + 2) = 18 5Х + 2 = 486 : 18 5Х + 2 =27 5Х =27 - 2 5Х =25 Х =5 проверка: 486 : ( 5 х 5 + 2) =18 18 = 18 5х(14 +b ) +6b =158 70 + 5b + 6b =158 11b = 158 - 70 11b = 88 b =8 проверка: 5 х ( 14 +8) + 6 х 8 = 158 158 = 158