Question

cho biết  A=\(\dfrac{\sqrt{x}+1}{\sqrt{x}-3}\)(x≥0,x≠9)

a,tìm x để A<1

b,tìm x để biểu thức A≤2

Answer 1

a: A<1

=>A-1<0

=>\(\dfrac{\sqrt{x}+1-\sqrt{x}+3}{\sqrt{x}-3}< 0\)

=>\(\dfrac{4}{\sqrt{x}-3}< 0\)

=>\(\sqrt{x}-3< 0\)

=>\(\sqrt{x}< 3\)

=>0<=x<9

b: Để A<=2 thì A-2<=0

=>\(\dfrac{\sqrt{x}+1-2\sqrt{x}+6}{\sqrt{x}-3}< =0\)

=>\(\dfrac{-\sqrt{x}+7}{\sqrt{x}-3}< =0\)

=>\(\dfrac{\sqrt{x}-7}{\sqrt{x}-3}>=0\)

TH1: \(\left\{{}\begin{matrix}\sqrt{x}-7>=0\\\sqrt{x}-3>0\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}\sqrt{x}>=7\\\sqrt{x}>3\end{matrix}\right.\)

=>\(\sqrt{x}>=7\)

=>x>=49

TH2: \(\left\{{}\begin{matrix}\sqrt{x}-7< =0\\\sqrt{x}-3< 0\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}\sqrt{x}< =7\\\sqrt{x}< 3\end{matrix}\right.\)

=>\(\sqrt{x}< 3\)

=>0<=x<9