题目分式2x\dfrac{2}{x}x2，xx2−1\dfrac{x}{x^{2}-1}x2−1x，3x+1\dfrac{3}{x+1}x+13的最简公分母是()(\quad)()A.x2−1x^{2}-1x2−1B.x(x2−1)x(x^{2}-1)x(x2−1)C.x2−xx^{2}-xx2−xD.(x+1)(x−1)(x+1)(x-1)(x+1)(x−1)知识点：最简公分母章节：未标注
