tolong ya no 18 dan19 jangan lupa pake cara

semoga membantu yaa..

MAPEL = MATEMATIKA
KELAS = 9
BAB = AKAR & PANGKAT

18.)
[tex] \frac{6}{ \sqrt{3} } \\ = \frac{6}{ \sqrt{3} } \frac{ \times \sqrt{3} }{ \sqrt{3} } \\ = \frac{6 \sqrt{3} }{3} \\ = 2 \sqrt{3} [/tex]

19.)
[tex] \frac{2}{5 + \sqrt{2} } \\ = \frac{2}{5 + \sqrt{2} } \frac{ \times 5 - \sqrt{2} }{ \times 5 - \sqrt{2} } \\ = \frac{2(5 - \sqrt{2} )}{25 - 2} \\ = \frac{2(5 - \sqrt{2} )}{23} \\ = \frac{10 - 2 \sqrt{2} }{23} [/tex]
semoga membantu