Вопрос школьника по предмету Математика
при каком значении неизвестной значение выражения а+8 меньше значения выражения 90-3а на 7
Ответ учителя по предмету Математика
(90 — 3a) — (a + 8) = 7
-4a + 82 = 7
-4a = -75
a = 75 : 4
a = 18.75
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