Вопрос школьника по предмету Математика
Составьте уравнение по условию задачи. В коробку с карандашами добавили 8 карандашей, потом еще 3 карандаша, а затем вынули 7 карандашей. В коробке стало 16 карандашей. Сколько карандашей было в коробке первоначально?
Ответ учителя по предмету Математика
Ответ:
12 карандашей
Пошаговое объяснение:
Пусть: первоначально было х карандашей.
Тогда: стало (х + 8 + 3 — 7) карандашей
Т. к. стало 16 карандашей:
х + 8 + 3 — 7 = 16
х = 16 + 7 — 3 — 8
х = 12
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