Exponents: Division rule: a^x / a^y = a^(x-y)

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  1. prove: 8582=852=83{8^5 \over 8^2} = 8^{5-2} = 8^3
    1. simplify: 100a16b3c72a4c8{100a^{16}b^3c^7 \over 2a^4c^8}
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