Question

Решите уравнение 9 (5х + 13) = 252 и 182 : (х - 15) = 14

Answer 1

Ответ:

$9 \cdot (5x+ 13) = 252$

$9 \cdot 5x + 9 \cdot 13 = 252$

$45x + 117 = 252$

$45x = 252 - 117$

$45x = 135$

$x = 135 : 45$

$x = 3$

Проверка:

$9 \cdot (5 \cdot 3 + 13) = 252$

$9 \cdot (15 + 13) = 252$

$9 \cdot 28 = 252$

$252 = 252$ - верно

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$182 :(x - 15) = 14$

$x-15 = 182 : 14$

$x-15 = 13$

$x = 15 + 13$

$x=28$

Проверка:

$182 : (28 - 15) = 14$

$182 : 13 = 14$

$14 = 14$ - верно