tlong d jwb no 6 7 8

6)
[tex] {2}^{ - 3} + {8}^{ \frac{ - 4}{3} } = \\ \frac{1}{8} + ( {2}^{3} )^{ \frac{ - 4}{3} } = \\ \frac{1}{8} + \frac{1}{16} = \frac{3}{16} [/tex]
jawabannya c

7)
[tex]6 \sqrt{3} + 5 \sqrt{12} - \sqrt{27} = \\ 6 \sqrt{3} + 5 \sqrt{4 \times 3} - \sqrt{9 \times 3} = \\ 6 \sqrt{3} + 10 \sqrt{3} - 3 \sqrt{3} = \\ 16 \sqrt{3} - 3 \sqrt{3} = \\ 13 \sqrt{3} [/tex]
maaf ketemunya yang itu

8)
[tex] \frac{6}{3 - \sqrt{3} } \times \frac{3 + \sqrt{3} }{3 + \sqrt{3} } = \\ \frac{18 + 6 \sqrt{3} }{9 + 3} = \\ \frac{18 + 6 \sqrt{3} }{12} = \\ \frac{6 + 2 \sqrt{3} }{4} = \frac{3 + \sqrt{3} }{2} [/tex]
tinggal di balik saja jadi, jawabanya b