Question

Resolva e identifique a alternativa correta:
$\frac{1}{ \sqrt{2} } + \frac{1}{ \sqrt{18} } - \frac{1}{ \sqrt{8} }$

a)
$\frac{ \sqrt{3} }{6}$

b)
$\sqrt{12}$

c)
$\frac{ - 10}{ \sqrt{288} }$

d)
$\frac{ - 5 \sqrt{2} }{12}$

e)
$\frac{5 \sqrt{2} }{12}$

Answer 1

$\frac{1}{ \sqrt{2} } + \frac{1}{ \sqrt{18} } - \frac{1}{ \sqrt{8} }$
$\frac{ \sqrt{2} }{2} + \frac{ \sqrt{18} }{18} - \frac{ \sqrt{8} }{8}$
$\frac{ \sqrt{2} }{2}+ \frac{3 \sqrt{2} }{18} - \frac{2 \sqrt{2} }{8}$
$\frac{ \sqrt{2} }{2} + \frac{ \sqrt{2} }{6} - \frac{ \sqrt{2} }{4}$
$\frac{6 \sqrt{2}+2 \sqrt{2}-3 \sqrt{2} }{12}$
$\frac{(6+2-3) \sqrt{2} }{12}$
$\frac{5 \sqrt{2} }{12}$

alternativa e.