若|2x+y+1|+√2y+3x=0,则xy=
若|2x+y+1|+√2y+3x=0,则xy=
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
1.若x-2√xy-3y=0 x>0求2x+y+√xy除以y-x-√xy
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
若x^2-3x=1,则x^2y-3xy-y
若2x平方+3xy-2y平方=0,求x+y/x-y
1.若x分之1-y分之1=2,则求x-xy-y分之3x+xy-3y=0的值.2.设x,y为实数,且x-y=3.求x乘根号