a + b = tolong pakai cara

[tex] \frac{ \sqrt{2} - \sqrt{3} }{ \sqrt{2} + \sqrt{3} } \times \frac{ \sqrt{2} - \sqrt{3} }{ \sqrt{2} - \sqrt{3} } \\ = \frac{2 - 2 \sqrt{6} - 3}{4 - 3} \\ = - 1 - 2 \sqrt{6} [/tex]
maka a = -1, b=-2
a+b= -1+-2=-3