tolong bantuin pake cara dong

4)
√48 - 5√3 +2√27
=√16x3 - 5√3 + 2√9x3
=4√3 - 5√3 + 2x3√3
=5√3

5)
[tex] \frac{4}{ \sqrt{5}+3 } \\ = \frac{4}{ \sqrt{5} +3} .\frac{ \sqrt{5}-3 }{ \sqrt{5}-3 } \\ =\frac{4 \sqrt{5}-12 }{ 5- 3^{2} } } \\ =\frac{4 \sqrt{5}-12 }{ -4 } } \\ = 3-\sqrt{5}[/tex]