Tìm x :
\(-\frac{4}{5}\) . \(|x|\) + \(1\frac{1}{3}\) . \(|x|\) = \(1\frac{1}{3}\)
Help me !
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\(\frac{-4}{5}.\left|x\right|+1\frac{1}{3}.\left|x\right|=1\frac{1}{3}\)
\(\left(\frac{-4}{5}+1\frac{1}{3}\right).\left|x\right|=1\frac{1}{3}\)\(\frac{8}{15}.\left|x\right|=\frac{4}{3}\)
\(\left|x\right|=\frac{4}{3}\div\frac{8}{15}\)
\(\left|x\right|=\frac{5}{2}\)\(\Rightarrow x=\pm\frac{5}{2}\)
Ta có: \(-\frac{4}{5}.\left|x\right|+1\frac{1}{3}.\left|x\right|=1\frac{1}{3}\)
=> \(\left(-\frac{4}{5}+1\frac{1}{3}\right).\left|x\right|=1\frac{1}{3}\) => \(\frac{8}{15}.\left|x\right|=\frac{4}{3}\)=> \(\orbr{\begin{cases}x=\frac{5}{2}\\x=-\frac{5}{2}\end{cases}}\)
#Hk_tốt
#Ken'z