题目下列各式从左边到右边的变形中,属于因式分解的是（ ）A.(a+1)(a−1)=a2−1(a+1)\left(a-1\right)=a^{2}-1(a+1)(a−1)=a2−1B.a2−2a+3=a(a−2)+3a^{2}-2a+3=a\left(a-2\right)+3a2−2a+3=a(a−2)+3C.x2⋅5x=5x3x^{2}\cdot 5x=5x^{3}x2⋅5x=5x3D.4x2−4x+1=(2x−1)24x^{2}-4x+1=\left(2x-1\right)^{2}4x2−4x+1=(2x−1)2知识点：因式分解的应用章节：数与式 / 因式分解
