сократите дробь! b^2+9b дробная черта b^2-81
(b^2+9b)/(b^2-81)=(b(b+9))/(b-9)(b+9)=b/(b-9)
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(b^2+9b)/(b^2-81)=(b(b+9))/(b-9)(b+9)=b/(b-9)
Verified answer