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4. C
5. 2⁻⁵ x 2⁻² = 2⁻⁷ = 1/2⁷ = 1/128 (c)
6. dalam hukum rasional, penyebut itu gaboleh ada yg akar. maka
7 x √6 per 3√6 x √6 = 7√6 per 3.6 = 7√6 per 18 (c)