(xy^2-2xy+x)*y^3-y分之y^3+y^2
(-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)]
已知X+Y分之XY等于3,求-X+3XY-Y分之2X-3XY+2Y
已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y=
已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!
(x+2y-3xy+2x+y-xy)-(-2-y+xy),其中x+y=2分之1,xy=-2分之1
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
2x+2y分之3y+x^2+xy分之2xy
计算:2x+2y分之3y + x²+xy分之2xy
2x+2y分之3y 加 x²+xy分之2xy
x^2-xy-6y^2+3xy+y+2