Question

Answer 1

Bài 1:

\(a,=2\sqrt{2}-15\sqrt{2}+18\sqrt{2}=5\sqrt{2}\\ b,=\sqrt{\dfrac{100}{2}}=\sqrt{50}=5\sqrt{2}\\ c,=\dfrac{\sqrt{5}+2-\sqrt{5}+2}{\left(\sqrt{5}-2\right)\left(\sqrt{5}+2\right)}=\dfrac{4}{1}=4\)

Bài 2:

\(a,5=\sqrt{25}>\sqrt{24}\\ b,2\sqrt{3}=\sqrt{12}< \sqrt{18}\)

Bài 3:

\(a,\Leftrightarrow2x=36\Leftrightarrow x=18\\ b,\Leftrightarrow2\left|x\right|=8\Leftrightarrow\left|x\right|=4\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-4\end{matrix}\right.\)

Answer 2

Bài 2: 

a: \(5>\sqrt{24}\)

b: \(2\sqrt{3}< \sqrt{18}\)