Question

clica na foto aí 7³7 me ajuda aqui​

Answer 1

Resolve-se a equação usando as propriedades da radiciação:

$\displaystyle  \begin{array}{{>{\displaystyle}l}}

\frac{1}{\sqrt{2}} -\frac{3}{\sqrt{8}} =\frac{1}{2^{\frac{1}{2}}} -\frac{3}{8^{\frac{1}{2}}} =2^{-\frac{1}{2}} -\frac{3}{2} *2^{-\frac{1}{2}}\\

\left( 1-\frac{3}{2}\right) *\frac{1}{\sqrt{2}} *\frac{\sqrt{2}}{\sqrt{2}} =\frac{2-3}{2} *\frac{\sqrt{2}}{2} =-\frac{\sqrt{2}}{4}