(a^3b^-1)^1/3(-2a^1/2b)^-2÷(4a^2b^4)^-1/2,
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![(a^3b^-1)^1/3(-2a^1/2b)^-2÷(4a^2b^4)^-1/2,](/uploads/image/z/10196444-20-4.jpg?t=%28a%5E3b%5E-1%29%5E1%2F3%28-2a%5E1%2F2b%29%5E-2%C3%B7%284a%5E2b%5E4%29%5E-1%2F2%2C)
(a^3b^-1)^1/3(-2a^1/2b)^-2÷(4a^2b^4)^-1/2,
(a^3b^-1)^1/3(-2a^1/2b)^-2÷(4a^2b^4)^-1/2,
(a^3b^-1)^1/3(-2a^1/2b)^-2÷(4a^2b^4)^-1/2,
原式=ab^-1\3(-2^-2)a^-1b^-2x2ab^2
=-1\2ab^-1\3