Đáp án:
c) (x - 2)(3 - x) = 0
\(\left[ \begin{array}{l}x-2=0\\3-x=0\end{array} \right.\) <=> \(\left[ \begin{array}{l}x=2\\x=3\end{array} \right.\)
d, 26 - 3 /x +9/ = -13
<=> 3|x+9| = 26 - (-13)
<=> 3|x+9| = 39
<=> |x+9| = 39:3
<=> |x+9| = 13
<=> \(\left[ \begin{array}{l}x-9 =13\\x-9 =-13\end{array} \right.\) <=>\(\left[ \begin{array}{l}x=22\\x=-4\end{array} \right.\)