4^3 × a^-5 × b^-4/ 4^5× a^-8×b^3
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=64×1/(a)^5×1/(b)^4÷1024×1/(a)^8×(b)^3
=1/(a)^5×1/(b)^4×1/16×1/(a)^8×(b)^2
=1/(a)^13×1/16×(b)^2/(b)^4
=1/(a)^13 × 1/16 × 1/(b)^2
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