题目给出下面四个多项式:①x2−xyx^{2}-xyx2−xy；②x2−y2x^{2}-y^{2}x2−y2；③x2−2xy+y2x^{2}-2xy+y^{2}x2−2xy+y2；④x2+y2x^{2}+y^{2}x2+y2,其中含因式(x−y)\left(x-y\right)(x−y)的多项式有（ ）A.111个B.222个C.333个D.444个知识点：因式分解章节：数学竞赛 / 数与式
