Ответ:
х = 5
Пошаговое объяснение:
6 × 15 + 4200 : (6x - 10) = 300
90 + 4200 : (6x - 10) = 300
4200 : (6x - 10) = 300 - 90
4200 : (6x - 10) = 210
(6x - 10) = 4200 : 210
6x - 10 = 20
6х = 20 + 10
6х = 30
х = 30 : 6
Проверка:
6 × 15 + 4200 : (6 × 5 - 10) = 300
90 + 4200 : (30 - 10) = 300
90 + 4200 : 20 = 300
90 + 210 = 300
300 = 300
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Ответ:
х = 5
Пошаговое объяснение:
6 × 15 + 4200 : (6x - 10) = 300
90 + 4200 : (6x - 10) = 300
4200 : (6x - 10) = 300 - 90
4200 : (6x - 10) = 210
(6x - 10) = 4200 : 210
6x - 10 = 20
6х = 20 + 10
6х = 30
х = 30 : 6
х = 5
Проверка:
6 × 15 + 4200 : (6 × 5 - 10) = 300
90 + 4200 : (30 - 10) = 300
90 + 4200 : 20 = 300
90 + 210 = 300
300 = 300