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njhieyjdf
#294.

 frac{b ^{2} +10b}{b ^{2-100} }= frac{b(b+10)}{(b-10)(b+10)}= frac{b}{b-10}

#295.

 frac{b^{2} -9b}{b^{2}-81 }= frac{b(b-9)}{(b-9)(b+9)}= frac{b}{b+9}

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