11: ĐKXĐ: x<>3,2
\(\dfrac{x-2}{3,2-x}=\dfrac{1}{2}\)
=>\(2\left(x-2\right)=3,2-x\)
=>2x-4=3,2-x
=>3x=7,2
=>\(x=\dfrac{7.2}{3}=2,4\)(nhận)
2: ĐKXĐ: x>=2
\(\sqrt{x-2}-1=\dfrac{7}{9}\)
=>\(\sqrt{x-2}=\dfrac{16}{9}\)
=>\(x-2=\left(\dfrac{16}{9}\right)^2=\dfrac{256}{81}\)
=>\(x=\dfrac{256}{81}+2=\dfrac{256+162}{81}=\dfrac{418}{81}\)