Tìm $x \in \mathbb{Z}$ sao cho :
$2\left | 3 - x \right | - 5x = -24$ với $x \geq 3$.
$2\left | 3 - x \right | - 5x = -24$
Started By tramyvodoi, 26-01-2013 - 20:26
#2
Posted 26-01-2013 - 20:37
Oral1020
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Vì $x \ge 3$
$\Longleftrightarrow 3-x \le 0$
Như vậy,ta bỏ dấu trị tuyệt đối như sau:
$-2(3-x)-5x=-24$
$\Longleftrightarrow x=6$
$\Longleftrightarrow 3-x \le 0$
Như vậy,ta bỏ dấu trị tuyệt đối như sau:
$-2(3-x)-5x=-24$
$\Longleftrightarrow x=6$
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Alfréd Rényi
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