\(A=\dfrac{x}{x+1}-\dfrac{-3x+3}{1-x+x^2}+\dfrac{x+4}{1+x^3}\)
\(A=\dfrac{x\left(x^2-x+1\right)}{x^3+1}-\dfrac{-3x+3\left(x+1\right)}{x^3+1}+\dfrac{x+4}{x^3+1}\)
\(A=\dfrac{x^3-x^2+x+3x+3+x+4}{x^3+1}\)
\(A=\dfrac{x^3-x^2+11x+7}{x^3+1}\)
Tích cho mình nha Đỗ Thanh Huyền
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