1: \(A=\dfrac{\left(x+1\right)^3}{\left(x+1\right)^2}=x+1\)
\(B=\dfrac{\left(x+1\right)\cdot\left(x^2-x+1\right)}{x+1}=x^2-x+1\)
2: A=B
=>x^2-x+1=x+1
=>x^2-2x=0
=>x=0 hoặc x=2
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