已知{2X-3Y=11,X+4Y=5,则3X+Y=

已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知{2X-3Y=11,X+4Y=5,则3X+Y= 已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy) (3x-2y)(4x-5y)-11(x+y)(x-y)+5xy,已知X=3又1/2,y=2又1/3 已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知实数x,y满足y=x^2+5x-4,则3x-2y最大值为 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 已知x^2+y^2-4x+2y+5=0则x^y=? 已知x^2+4x+y^2+2y+5=0,则x^y= 已知x-y=3则5(x-y)-3x+3y-2= 已知x-y=3则5(x-y)-3x+3y-2= 已知x²+4x+y²-2y+5=0,则x+y= 已知3x-4y=0,则x^2-y^2/x^2+y^2 已知4x=5y,那么(3x+y)/(x-2y)= 已知-x+y=3,则2(x-y)2次方-4(x-y)+6 已知|5x-y-8|+(7y-x+2)=0则4x+6y