[填空题]
$\text { Solve the equation } \log _{5} x-\log _{5} 4=2+\log _{5} 3 \text { for } x \text {. }Given that \log _{a} 2=5 .$
1. Find the exact value of $\log _{a} 32$ .
2. Find the exact value of $\log _{\sqrt{a}} 2$ .
3 . Find the value of a , giving your answer correct to 3 significant figures. ≈
