(4a^2b^3)^2÷(1/2a^3b^5)÷(16ab)

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(4a^2b^3)^2÷(1/2a^3b^5)÷(16ab)

原题=16a^4b^6÷(1/2a^3b^5)÷(16ab)=(32ab)÷(16ab)=2