Question

Answer 1

Bài 4: 

Ta có: \(3\sqrt{2x}-\sqrt{32x}+\sqrt{8x}=6\)

\(\Leftrightarrow3\sqrt{2x}-4\sqrt{2x}+2\sqrt{2x}=6\)

\(\Leftrightarrow2x=36\)

hay x=18

Answer 2

bài 1

a)√25=5

b)ĐKXĐ:x≥5

bài 2

a)\(\sqrt[]{\dfrac{81}{25}.\dfrac{49}{16}}\)=\(\dfrac{63}{20}\)