c)
`x^2:16/11=11/4`
`⇒x^2=11/4 . 16/11`
`⇒x^2=4`
`⇒x=±2`
d)
`|x-2|-3=0`
`⇔|x-2|=3`
`⇔`\(\left[ \begin{array}{l}x-2=3\\x-2=-3\end{array} \right.\)
`⇔`\(\left[ \begin{array}{l}x=3+2\\x=-3+2\end{array} \right.\)
`⇔`\(\left[ \begin{array}{l}x=5\\x=-1\end{array} \right.\)