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jadi 32p pangkat 5
13. (-x^-7).x^8 = (-1^-7× x^-7) . x^8 = -1x = -x (B)
14. 2^4 a^6 b^7 ÷ 2 a^2 b^3 = 2^(4-1) a^(6-2) b^(7-3) = 2^3 a^4 b^4 = 8 a^4 b^4 (C)