x^2y-3xy^2+2yx^2-y^2x化简
已知x-y=4xy,则2x+3xy-2yx-2xy-y
3xy+xy+2x²y+yx²+3x²y等于多少
-x^2y+5xy^2-yx^2合并同类项
3x^2y-3xy^2+6yx^2-9y^2x
实数x、y、z满足x=6-3yx+3y-2xy+2z
已知y=3xy+x,求代数式2x+3xy−2yx−2xy−y
x²-3xy-3x²y²+2yx²-y²x 合并同类项
化简、、、最好有过程x²y-3xy²+2yx²-y²x2、(3a²-a
.先化简,后计算.[2x(x²y-xy²)+xy(xy-x²)]/x²yx=20
合并同类项:6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y
已知3x2+xy-2y2=0,求(x+yx-y+4xyy
已知2x2-xy-3y2=0,求x−yx+y