làm phép tính
\(\dfrac{x}{x^2+2xy}+\dfrac{1}{x-2y}+\dfrac{4y}{4y^2-x^2}\)
\(\dfrac{2x}{x-1}+\dfrac{5x^2-5}{x^2+2x+1}.\dfrac{2x+2}{5-5x}\)
\(\left(\dfrac{2x}{2x-1}+\dfrac{3x}{2x+1}\right).\dfrac{4x^2-4x+1}{8x^2+10x}\)
\(\dfrac{5x-5}{2x}.\left(\dfrac{x+1}{x-1}-\dfrac{x-1}{x+1}\right)\)
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