X^2Y-3XY^2+2YX^2-Y^2X=?

3xy+xy+2x²y+yx²+3x²y等于多少 xy^2-x-yx^2+y变为(y-x)(xy+1)xy^2-x-yx^2+y化为(y-x)(xy+1)感觉不像十字相乘法. xy-3xy+2yx-yx -x^2y+5xy^2-yx^2合并同类项 因式分解x^2+xy+3x+3yx^2+xy+3x+3y 因式分解 x^2y-3xy^2+2yx^2-y^2x化简 X^2Y-3XY^2+2YX^2-Y^2X=? 化简 x²y-3xy²+2yx²-y²x x²y-3xy²+2yx²-y²x x²y－3xy²+2yx²－y²x,急用! x²y-3xy²+2yx²-y²x（列算式） 已知X-Y=4XY,求(2X+3Y-2Y)/(X-2YX-Y)的值 2x²y+3xy²+5xy-6yx+2 合并同类项 合并同类项 2x的平方y+3xy的平方+5xy-6yx+2 (xy-x^2)÷x^2-2xy+y^2/xy*x-y/y^2*yx^-2(xy-x^2)÷{x^2-2xy+y^2/xy}*{x-y/y^2}*{yx^-2} （2xy-y）-（-y+yx） 怎么化简 化简（2xy-y）-（-y+yx）得多少? 已知x-y=6,xy=-1,求(2x+3x-2xy)-(x+4y+xy)-(3yx-2x+2y)的值