题目下列各式由左边到右边的变形中,是因式分解的是（ ）A.a(x+y)=ax+aya\left(x+y\right)=ax+aya(x+y)=ax+ayB.x2−4x+4=x(x−4)+4x^{2}-4x+4=x\left(x-4\right)+4x2−4x+4=x(x−4)+4C.10x2−5x=5x(2x−1)10x^{2}-5x=5x\left(2x-1\right)10x2−5x=5x(2x−1)D.(x−1)2=x2−1(x-1)^{2}=x^{2}-1(x−1)2=x2−1知识点：因式分解章节：数学竞赛 / 数与式
