x+y=5,则(-x^2-y^2/2xy)^2除以(x-y/-xy)^2的值是多少?
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若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________?
若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
函数f(xy,x+y)=x^2+xy+y^2,则df(x,y)=?
f(xy,x-y)=x^2+3xy+y^2,则f(x,y)=?
X-Y=5,XY=2,则Y/X + X/Y=?
已知x+y=2,xy=-5则x分之y+y分之x等于
2x^+xy-y^-4x+5y-6=?
已知x+y=5,xy=2则x^2y+xy^2=( )
已知x+y=1,xy=1/5,则x^2y=xy^2
若 x+y=5,xy=-50 则x^2y+xy^2 =( )
若x-y=1,xy=5,则x^2y-xy^2=
已知x+y=5,xy=-3,则x^2y+xy^2,
(1/x)+(1/y)=5,则(2x-5xy+2y)/(x+2xy+y)=?
若x/1-y/1=5,则x-2xy-y/2x+5xy-2y=?
已知1/x+1/y=5,则2x-5xy+2y/x+2xy+y