\(A=\dfrac{x^5+5x^2+8}{3x^2+1}.\dfrac{x^2+3x-4}{x^2+5x+4}.\dfrac{3x^2+1}{3x^2+1}\)
\(A=\left(\dfrac{x^5+5x^2+8}{3x^2+1}.\dfrac{3x^2+1}{x^5+5x^2+8}\right).\dfrac{x^2-x+4x-4}{x^2+x+4x+4}\)
\(A=1.\dfrac{x\left(x-1\right)+4\left(x-1\right)}{x\left(x+1\right)+4\left(x+1\right)}\)
\(A=\dfrac{\left(x+4\right)\left(x-1\right)}{\left(x+4\right)\left(x+1\right)}\)
\(A=\dfrac{x-1}{x+1}\)
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Bình luận (1)
a. KClO3 ---> KCl + O2
b. Fe + Cl2 ---> FeCl3
d. Fe(OH)3 ---> Fe2O3 + H2O