(3x²y-6xy)÷6xy等于几
(3x-y)²+6xy等于多少?
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
合并同类项:(2xy²+3xy²)-(6x²y-3xy²)
x^2-xy-6y^2+3xy+y+2
2x(x²y-xy²)+xy(xy-x²)]÷x²y等于多少
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
xy+x-y=18,x,y各等于几
3xy+xy+2x²y+yx²+3x²y等于多少
已知x y=6,xy=-3,则3x-2xy 3y的值等于?
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+
已知x+y=2.xy=3,则x的平方+y的平方+6xy等于
已知X+Y=6,XY=-3,则X的平方Y+XY的平方等于什么?