Question

Answer 1

Bài 1:

a) \(=5\sqrt{3}-4\sqrt{3}+3\sqrt{3}=4\sqrt{3}\)

b) \(=\dfrac{1}{\left(a-2\right)\left(a+2\right)}.\left(a-2\right).3\sqrt{2}=\dfrac{3\sqrt{2}}{a+2}\)

Bài 2:

a) \(pt\Leftrightarrow\left|x-2\right|=10\Leftrightarrow\left[{}\begin{matrix}x-2=10\\x-2=-10\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=12\\x=-8\end{matrix}\right.\)

b) ĐKXĐ: \(x\ge-1\)

\(pt\Leftrightarrow2\sqrt{x+1}=6\Leftrightarrow\sqrt{x+1}=3\)

\(\Leftrightarrow x+1=9\Leftrightarrow x=8\left(tm\right)\)