已知:-x+2y-6=0,则3(x-2y)^2-5(x-2y)+6=
已知x-5y=0(y≠0),则代数式2x-3y/3x+6y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0
已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.
已知x,y为实数,根号3x+4 +y^2-6Y+9=0则x+y=?
已知x-2y=3,则(2x+y-6)/(3x-y-9)=?
已知x+y=6,x-y=5,则x^2-y^2等于多少
已知:x²y²-2x+6y+10=0则x+y=
已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于