Answer
$$\frac{1}{10^4}.$$
Work Step by Step
To express the result in positive exponents, we have
$$\frac{(10^{-4}\times 10^3)^{-2}}{10^6}=\frac{(10^{2})^{-2}}{10^6}=\frac{10^{2}}{10^6}=\frac{1}{10^4}.$$
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