Question

Simplificando a expressão √4/9-√16/81 com conta pfvr

a)1/9
b)2/9
c)0
d)2/3

Answer 1

√4/9-√16/81
2/3-4/9
6/9-4/9=2/9

Answer 2

$\sqrt{ \dfrac{4}{9}} - \sqrt{\dfrac{16}{81}} \\ \\ \\ \dfrac{ \sqrt{4} }{ \sqrt{9}} - \dfrac{ \sqrt{16}}{ \sqrt{81}} \\ \\ \\ \dfrac{2}{3} - \dfrac{4}{9} \\ \\ \\ MMC ~de ~3, 9 ~= 9 \\ \\ \\ \dfrac{6 - 4}{9} \\ \\ \\ =\ \textgreater \ \dfrac{2}{9}$

Resposta letra b)  2/9