题目下列各式从左到右,是因式分解的是（ ）A.(y−1)(y+1)=y2−1(y-1)\left(y+1\right)=y^{2}-1(y−1)(y+1)=y2−1B.x2y+xy2−1=xy(x+y)−1x^{2}y+xy^{2}-1=xy\left(x+y\right)-1x2y+xy2−1=xy(x+y)−1C.(x−2)(x−3)=(3−x)(2−x)(x-2)\left(x-3\right)=\left(3-x\right)\left(2-x\right)(x−2)(x−3)=(3−x)(2−x)D.x2−4x+4=(x−2)2x^{2}-4x+4=\left(x-2\right)^{2}x2−4x+4=(x−2)2知识点：提公因式法章节：数与式 / 因式分解
