题目先化简,再求值:2(2xy2−x2y)−(x2y−6xy2)+3x2y2(2xy^{2}-x^{2}y)-(x^{2}y-6xy^{2})+3x^{2}y2(2xy2−x2y)−(x2y−6xy2)+3x2y,其中x=2x=2x=2,y=−1y=-1y=−1.知识点：整式化简求值章节：未标注
