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1. (4/5)^-4 = (5/4)(5/4)(5/4)(5/4) = 625/256
2. (-3/7)^-2 = (-7/3)(-7/3) = 49/9
3. (-2/3p)^5 = (-2/3p)(-2/3p)(-2/3p(-2/3p) (-2/3p) = -32/243p^5
4. (-3a/2b)^-3 = (-2b/3a)(-2b/3a)(-2b/3a) = -8b^3/27a^3