Đề sai. Sửa đề \(\sqrt{2059-x}+\sqrt{2035-x}+\sqrt{2154-x}=24\) (1)
Điều kiện: \(x\le2035\)
\(\left(1\right)\Leftrightarrow\left(\sqrt{2059-x}-7\right)+\left(\sqrt{2035-x}-5\right)+\left(\sqrt{2154-x}-12\right)=0\)
\(\Leftrightarrow\frac{2010-x}{\sqrt{2059-x}+7}+\frac{2010-x}{\sqrt{2035-x}+5}+\frac{2010-x}{\sqrt{2154-x}+12}=0\)
\(\Leftrightarrow\left(2010-x\right)\left(\frac{1}{\sqrt{2059-x}+7}+\frac{1}{\sqrt{2035-x}+5}+\frac{1}{\sqrt{2154-x}+12}\right)=0\)
Ta thấy biếu thức \(\frac{1}{\sqrt{2059-x}+7}+\frac{1}{\sqrt{2035-x}+5}+\frac{1}{\sqrt{2154-x}+12}\)luôn dương nên \(2010-x=0\Leftrightarrow x=2010\)(TM)
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