Question

помогииииите дам 20 б

Answer 1

$dfrac{ sqrt{9 + a^2 - 6a} }{a - 3 } = dfrac{ sqrt{(a - 3)^2} }{a - 3 } = dfrac{|a - 3|}{a - 3 } = dfrac{|2,5 - 3|}{2,5 - 3} = dfrac{0,5}{-0,5} = -1$
Ответ: -1. 

Answer 2

$sqrt{(9+a^2-6a)} /(a-3)= sqrt{(a-3)^2} /(a-3)=|a-3|/(a-3)=$$|2,5-3|/(2,5-3)=0,5/(-0,5)=-1$