-a的n-2次方b的n+1次方÷(-1/3a的n-4次方b的n-2次方)·2ab²
=-a^(n-2)b^(n+1)÷[(-1/3)a^(n-4)b^(n-2)]·2ab²
=[(-1)÷(-1/3)] × a^[(n-2)-(n-4)] × b^[(n+1)-(n-2)] × 2ab²
=3a^2b^3*2ab^2
=6a^3b^5
-a的n-2次方b的n+1次方÷(-1/3a的n-4次方b的n-2次方)·2ab²
=-a^(n-2)b^(n+1)÷[(-1/3)a^(n-4)b^(n-2)]·2ab²
=[(-1)÷(-1/3)] × a^[(n-2)-(n-4)] × b^[(n+1)-(n-2)] × 2ab²
=3a^2b^3*2ab^2
=6a^3b^5