[Puriwatt]

ข้อ 2. แบบมอต้น
$6^{\frac{1}{a}} = 2$ ----(1)
$6^{\frac{1}{b}} = 3$ ----(2)
$6^{\frac{1}{c}} = 36$ ----(3)

(1)×(2)×(3), ได้ $6^{\frac{1}{a}+\frac{1}{b}+\frac{1}{c}} = 2×3×36 = 6^3$

ดังนั้น $ \frac{1}{a}+\frac{1}{b}+\frac{1}{c} = 3$