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Ta có: \(B=\left|x-\dfrac{1}{7}\right|-\left|x+\dfrac{3}{5}\right|+\dfrac{4}{5}\)
\(=-x+\dfrac{1}{7}-x-\dfrac{3}{5}+\dfrac{4}{5}\)
\(=-2x+\dfrac{12}{35}\)
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\(P=\left|5-\sqrt{24}\right|+3+\sqrt{24}=5-\sqrt{24}+3+\sqrt{24}=8\)
\(P=\left|5-\sqrt{24}\right|+3+\sqrt{24}\)
TH1 : \(\left|5-\sqrt{24}\right|=5-\sqrt{24}\)
TH2 : \(\left|5-\sqrt{24}\right|=-5+\sqrt{24}\)
Với TH1 thì : \(\left|5-\sqrt{24}\right|+3+\sqrt{24}=5-\sqrt{24}+3+\sqrt{24}=8\)
Với TH2 thì : \(\left|5-\sqrt{24}\right|+3+\sqrt{24}=-5+\sqrt{24}+3+\sqrt{24}=-2+2\sqrt{24}\)