6x²y+2yx²-4x²y=

6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x² 求6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x 已知x²y²-8xy+4x²+y²+4=0,求y-2x+（yx/2）的2013次 3xy+xy+2x²y+yx²+3x²y等于多少 .先化简,后计算.[2x(x²y-xy²)+xy(xy-x²)]/x²yx=20 3X²y-3y²X+2Xy²-2yX²当y=-2,X=3时. x²-3xy-3x²y²+2yx²-y²x 合并同类项 已知x-3y=0，求2x+yx y^2-x^2\5x^2-4yx除以x+y\5x-4y 实数x、y、z满足x=6-3yx+3y-2xy+2z 已知x-y=4xy，则2x+3xy-2yx-2xy-y 已知关于x的方程x分之4+y=yx-2y