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Câu 1) [TEX]20.(\frac{x-2}{x+1})^2 - 5(\frac{x+2}{x-1})^2 + 48.\frac{x^2-4}{x-1}[/TEX] = 0
Câu 2)[TEX] \frac{x^2+2x+7}{x^2+2x+3} - x^2+4x+4=0[/TEX]
Câu 2)[TEX] \frac{x^2+2x+7}{x^2+2x+3} - x^2+4x+4=0[/TEX]