若(2x-3y+5)^2+|x+y-2|=0,则x= y=
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
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*
若|2x-y+5|+(x+2y-4)的平方=0,则(2x-y)的三次方-(x-3y)(y-2x)的平方
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
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=____
若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=