Question

Cho biểu thức D = \(\left(\frac{1}{x-1}-\frac{x}{1-x^3}.\frac{x^2+x+1}{x+1}\right):\left(\frac{2x+1}{x^2+x+1}\right)\)

Rút gọn D

Answer 1

\(\left(\frac{1}{x-1}-\frac{x}{1-x^3}.\frac{x+x+1}{x+1}\right):\left(\frac{2x+1}{x^2+x+1}\right)\)

\(=\left(\frac{1}{x-1}-\frac{x}{\left(1-x\right)\left(1^2+x+x^2\right)}.\frac{x\left(x+1\right)}{\left(x+1\right)}\right):\left(\frac{2x+1}{x^2+x+1}\right)\)

Answer 2

 D=[1/(x-1)-x/(1-x^3).(x^2+x+1)/(x+1)]:[(2x+1)/(x^2+x+1)]

=[1/(x-1)+x/(x-1)(x^2+x+1).(x^2+x+1)/(x+1)]:[(2x+1)/(x^2+x+1)]

=[1/(x-1)+x/(x-1)(x+1)]:[(2x+1)/(x^2+x+1)]

=(x+1+x)/(x-1)(x+1) . x(x+1)+1/2x+1

=2x+1/(x-1)(x+1)  .  x(x+1)+1/2x+1

=x+1/x-1

Answer 3

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