题目把下列各式因式分解.(1)x3−2x2y+xy2(1)x^{3}-2x^{2}y+xy^{2}(1)x3−2x2y+xy2；(2)x2(a−1)+y2(1−a)(2)x^{2}(a-1)+y^{2}(1-a)(2)x2(a−1)+y2(1−a).知识点：提公因式法章节：数与式 / 因式分解
