题目下面各式从左到右的变形,属于因式分解的是（ ）A.x2−x−1=x(x−1)−1x^{2}-x-1=x\left(x-1\right)-1x2−x−1=x(x−1)−1B.x2−1=(x−1)2x^{2}-1=\left(x-1\right)^{2}x2−1=(x−1)2C.x2−x−6=(x−3)(x+2)x^{2}-x-6=\left(x-3\right)\left(x+2\right)x2−x−6=(x−3)(x+2)D.x(x−1)=x2−xx\left(x-1\right)=x^{2}-xx(x−1)=x2−x知识点：十字相乘法章节：数与式 / 因式分解
