đề toán

H

hien_vuthithanh

$| x-5|+|15-3x|+|-25+5x|=9$

\Leftrightarrow $|x-5|+3|x-5|+5|x-5|=9$

\Leftrightarrow $9|x-5|=9$

\Leftrightarrow $|x-5|=1$

\Rightarrow $S=\{-4;6\}$
 
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