X^2Y-3XY^2+2YX^2-Y^2X=?
已知x-y=4xy,则2x+3xy-2yx-2xy-y
实数x、y、z满足x=6-3yx+3y-2xy+2z
3xy+xy+2x²y+yx²+3x²y等于多少
已知y=3xy+x,求代数式2x+3xy−2yx−2xy−y
-x^2y+5xy^2-yx^2合并同类项
3x^2y-3xy^2+6yx^2-9y^2x
.先化简,后计算.[2x(x²y-xy²)+xy(xy-x²)]/x²yx=20
已知3x2+xy-2y2=0,求(x+yx-y+4xyy
已知2x2-xy-3y2=0,求x−yx+y
已知xy满足x^2+y^2+4/5=2x+y 求代数式yx/x+y的值
已知x+y=2,xy=-5,则yx+xy
已知x-3y=0,求2x+yx