X-Y=5,XY=2,则Y/X + X/Y=?
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|x|/x+y/|y|+xy/|xy|=
x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________?
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=
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
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
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)=?
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值
2x^+xy-y^-4x+5y-6=?
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知x.y满足X2-y2=2xy.则x-y/x+y=?x.
(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=?
x+y=-5,xy=3,则-x^3y-xy^3+2x^2y^2等于
已知2/X-1/Y=3,则(X-2Y-XY)/(5XY+6Y-3X)=?