Question

thu gọn biểu thức có chứa căn thức

(5√2 -√8 + √32) :√2

Answer 1

\(\dfrac{5\sqrt{2}-\sqrt{8}+\sqrt{32}}{\sqrt{2}}=\dfrac{5\sqrt{2}-2\sqrt{2}+4\sqrt{2}}{\sqrt{2}}=\dfrac{7\sqrt{2}}{\sqrt{2}}=7\)

Answer 2

`(5sqrt2-sqrt8+sqrt32):sqrt2`

`= \frac{5sqrt2}{sqrt2}-\frac{sqrt8}{sqrt2}+\frac{sqrt32}{sqrt2}`

`= 5-sqrt4+sqrt16`

`= 5-2+4`

`= 7`