Question

giúp với ạ

Answer 1

Giúp với :( 

Answer 2

\(E=\sqrt{\left(3-2\sqrt{2}\right)^2}+\sqrt{\left(3\sqrt{2}+1\right)^2}\)

\(=\left|3-2\sqrt{2}\right|+\left|3\sqrt{2}+1\right|\)

\(=3-2\sqrt{2}+3\sqrt{2}+1\)

\(=4+\sqrt{2}\)

Answer 3

d: Ta có: \(\sqrt{9x^2-2}-3x=5\)

\(\Leftrightarrow9x^2-2=\left(3x-5\right)^2\)

\(\Leftrightarrow9x^2-30x+25-9x^2+2=0\)

\(\Leftrightarrow-30x=-27\)

hay \(x=\dfrac{9}{10}\left(nhận\right)\)