若[x-y+3]+|2x+y|=0,则x+y=?
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
若3x-4y=0,则x/y=______,(x-y)/y=______,(3x+2y)/(2x+3y)=_____.
若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=
1.若2x-3y=0,则x+y/x-y(是个分数额)=( )
若全集I={(x,y)|x,y∈R},集合M={(x,y)|(y-3)/(x-2)},N{(x,y)|y=x=1},则(
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
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
若线段x ,y 满足[2x-3y]*[3x+2y]=0 则x/y=?怎样算出2x-3y=0或3x+2y=0 当2x-3y
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
若x,y互为相反数(y≠0),则2x+5+2y+3x/y=____