已知(x-3)²+|y+5|=0,则xy-y^x=__________
已知(x-3)²+|y+5|=0,则xy-y^x=__________
1.已知:5x^2-4xy+y^2-2x+1=0,则(x-y)^2005+__________.
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知x+y=5,xy=3,x³+y³=(x+y)(x²-xy+y²),则1/x&
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知2x²-5xy-3y²=0(xy≠0),则y分之x+x分之y的值是?
已知x+y=5,xy=-3,则x^2y+xy^2,
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知X/Y=2,则X²+2XY-3Y²/X²-XY+Y²=?