tolong dijawab??????????????????

[tex] \frac{3}{2 \sqrt{5} - 1 } \times \frac{2 \sqrt{5} + 1}{2 \sqrt{5} + 1 } \\ = \frac{6 \sqrt{5} + 3}{20 - 1} \\ = \frac{6 \sqrt{5} + 3 }{19} \: \: (a)[/tex]

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