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Verified answer
2^-2 = 1 / 2^2 = 1/43^4 = 9 x 9 = 81
6^3 = 216
= 1/4 . 81 / 216
= 81 / 864 (bagi 27)
= 3 / 32
-2²+3⁴:6³= -4×81:216= -324:216=1/6