Tìm $x$ biết rằng : $\sqrt{4x^{2}-4x+1}\leq 5-x$
    Cho tớ hỏi có ai chơi chinh phục vũ môn ko,xin hãy cho tớ biết về luật chơi vs.
ôkê , liên hệ FB đi t chụp cho :v –  Tôi đi code dạo 03-01-16 08:44 PM
cho tui nhé –  Sea Dragon 01-01-16 09:02 PM
Tui có vài cái thẻ 50k chinh phục vũ môn lấy k :v –  Tôi đi code dạo 30-12-15 08:20 PM
há háhá háhá háhá há –  Sea Dragon 25-09-15 09:52 PM
nao$ ai ko có nếp nhăn....chỉ nhiều hay ít thôi –  ๖ۣۜJinღ๖ۣۜKaido 24-09-15 06:32 AM
Đk $ x \leq 5$
pt $\Leftrightarrow \sqrt{(2x-1)^2} \leq 5-x\Rightarrow |2x-1| \leq 5-x$
$*$ Với $2x-1 \geq 0$ hay $ x \geq \frac{1}{2}$. Ta có $2x -1 =|2x-1| \leq 5-x\Rightarrow x \leq 2$
Kết hợp đk $\Rightarrow \frac{1}{2} \leq x \leq 2 \color{red}{(\bigstar)}$
$*$ với $2x-1 <0$ hay $x < \frac{1}{2}$. Ta có $1-2x = |2x-1| \leq 5-x\Rightarrow x \geq -4 $ 
Kết hợp đk $\Rightarrow-4 \leq x < \frac{1}{2} \color{red}{(\bigstar \bigstar)}$
Từ $\color{red}{(\bigstar)}$ và $\color{red}{(\bigstar \bigstar)}\Rightarrow \color{red}{-4 \leq x \leq 2}$ là nghiệm của bất phương trình

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