Сократите дроби: 17a^3b + 17a^4c/ 51a^2b^2 - 51a^4c^2 c^2 - 18c + 81/ c - 9

[latex] frac{17a^3b+17a^4c}{51a^2b^2-51a^4c^2}= frac{17a^3(b+ac)}{51a^2(b^2-a^2c^2)}= frac{17a^3(b+ac)}{51a^2(b-ac)(b+ac)}= frac{17a}{51(b-ac)}[/latex][latex] frac{c^2-18c+81}{c-9} = frac{(c-9)^2}{c-9} =c-9[/latex]