若|x+y+4|+(x-y+2)²=0,则3x+2y=( )
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
若|x+y+4|+(x-y+2)²=0,则3x+2y=( )
若实数x,y满足x的平方+y的平方-4x-2y+5=0,则(x+y)/2x-3=
若3x-4y=0,则x/y=______,(x-y)/y=______,(3x+2y)/(2x+3y)=_____.
若x,y互为相反数(y≠0),则2x+5+2y+3x/y=____
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
.先化简再求值:(2x+y)(2x+y)-(2x-y)平方其中X,Y满足X平方+Y平方-2X+4Y+5=0
若|5x+2y-12|+(3x+2y-6)(3x+2y-6)=0,则2x+4y=
若(x-4y)(x+3y)=0 且xy>0 则分式x+3y/2x-y的值为