cần giúp

N

nhuquynhdat

x< 0 \Rightarrow $\dfrac{|x+1| + |x| + x}{3x^2 - 4x + 1}$

= $\dfrac{1-x + x - x}{3x^2 - 3x-x + 1}$

= $\dfrac{1- x}{(3x -1)(x-1)}$

=$\dfrac{-1}{3x-1}$
 
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