no 19 gmn? pake cara!

[tex] = \frac{10}{2 \sqrt{3} + \sqrt{7} } \times \frac{2 \sqrt{3} - \sqrt{7} }{2 \sqrt{3} - \sqrt{7} } \\ = \frac{20 \sqrt{3} - 10 \sqrt{7} }{12 - 7} \\ = \frac{20 \sqrt{3} - 10 \sqrt{7} }{5} \\ = 4 \sqrt{3} - 2 \sqrt{7} [/tex]

10/ 2akar3 + akar 7
= 10 ( 2akar3 - akar 7) / 5
= 2 (2akar3 - akar 7)
= 4akar3 - 2akar7

[ / = per ]

Smga Membantu >.<