若|x-2|+|2y+6|=0,则x+y的值是( )若|x-2|+|2y+6|=0,则x+y的值是( )
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若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若x^2+y^2-6x+8y+25=0 则y/x-x/y的值是
若x^2+2x+y^2-6y+10=0,则x-y
若x^2+y^2-10x+6y+34=0,则x+y=?
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若实数X,Y满足X²+Y²+4X-2Y +1=0,则X²-6X+Y²-2Y的最大值是多少
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是()?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8?(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8
若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=?
若f(x+y,y/x)=x^2-y^2,则F(X,Y)=
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
(5)若x/2=y/3(y不为0)则x/y=____,x+y/y=___,y/x-y=___.
若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x=
若2x-5y=0,则y:x
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*y)的值
x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知X*X+Y*Y+6X-8Y+25=0 求(Y/X)+(X/Y)-2=?