Jawapan

2016-07-07T11:43:01+08:00
(2×3³×16^½÷81)^-2
=(2×3³×2^4(½)÷3⁴)^-2
=(2×3³×2²÷3⁴)^-2
=[(2×2²)×(3³÷3⁴)]^-2
=(8×3^-1)^-2
=2^3+(-2)×3^-1+(-2)
=2×3^-3