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natalyabryukhova

Ответ:

frac{a^-^1b^7}{(2a)^2b^4}*frac{6}{a^-^3b^3}=frac{b^7*6*a^3}{a*4a^2b^4b^3}=frac{6a^3b^7}{4a^3b^7}=frac{6}{4}=1frac{1}{2}

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