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\(A=\)\(\frac{x|x-2|}{x^2+8x-20}+12x-3.\)
\(=\frac{x|x-2|}{\left(x-2\right)\left(x+10\right)}+12x-3\)
Nếu \(x\ge2\Rightarrow x-2\ge0\Leftrightarrow|x-2|=x-2\)
\(\Rightarrow A=\frac{x\left(x-2\right)}{\left(x-2\right)\left(x+10\right)}+12x-3=\frac{x}{x+10}+12x-3\)
Nếu \(x< 2\Rightarrow x-2< 0\Leftrightarrow|x-2|=-\left(x-2\right)\)
\(\Rightarrow A=\frac{-x\left(x-2\right)}{\left(x-2\right)\left(x+10\right)}+12x-3=\frac{-x}{x+10}+12x-3\)
a) \(x\ge\frac{2}{3}\Rightarrow3x-2\ge0\Rightarrow\left|3x-2\right|=3x-2\)
\(\Rightarrow P=\frac{1}{2}-\frac{1}{2}\left(x:\frac{1}{6}-\frac{1}{4}\right)-2\left(3x-2\right)\)
\(\Rightarrow P=\frac{1}{2}-\frac{1}{2}\left(6x-\frac{1}{4}\right)-6x+4\)
\(\Rightarrow P=\frac{4}{8}-3x+\frac{1}{8}-6x+\frac{32}{8}\)
\(\Rightarrow P=\frac{37}{8}-9x\)
b) \(x< \frac{2}{3}\Rightarrow3x-2< 0\Rightarrow\left|3x-2\right|=2-3x\)
\(\Rightarrow P=\frac{1}{2}-\frac{1}{2}\left(x:\frac{1}{6}-\frac{1}{4}\right)-2\left(2-3x\right)\)
\(\Rightarrow P=\frac{1}{2}-\frac{1}{2}\left(6x-\frac{1}{4}\right)-4+6x\)
\(\Rightarrow P=\frac{4}{8}-3x+\frac{1}{8}-\frac{32}{8}+6x\)
\(\Rightarrow P=\frac{-27}{8}+3x\)