若(5X+2Y-12)(5X+2Y-12)+|3x+2y-6|=0,则2x+4y=?
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
若x-2y=5,则式子12-x+2y=.以知3x-4y=2x+y则x∶y=
若5x+3y=3x+4y=x+2y+6,则x+y=___
解方程组:x+y/2+x-y/3=6 4(x+y)-5(x-y)=12
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
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*
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若(5X+2Y-12)(5X+2Y-12)+|3x+2y-6|=0,则2x+4y=?
若|5x+2y-12|+(3x+2y-6)(3x+2y-6)=0,则2x+4y=
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于