已知(2x+3y-4)²+|x+4y-7|=0则x= y=
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的
已知x²+4x+y²-2y+5=0,则x+y=
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
已知4x²+y²-4x-6y+10=0求(2/3x(√9x)+(y²√x/y³)
已知x+y+2(-x-y+1)=3(1-y-x)-4(y+x-1),则x+y等于( )
已知X²+3XY-4Y²=0(Y≠0)求X-Y/X+Y
已知x,y为实数,根号3x+4 +y^2-6Y+9=0则x+y=?