ini apaa ya tlng bantu

[tex] = \sqrt{ \frac{1}{49} + \frac{1}{7} } \\ = \sqrt{ \frac{1 + 7}{49} } \\ = \sqrt{ \frac{8}{49} } \\ = \frac{ \sqrt{8} }{ \sqrt{49} } \\ = \frac{2 \sqrt{2} }{7} \\ = \frac{2}{7} \sqrt{2} [/tex]


Opsi D