若x>=0,y>=0,2x+3y

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= 若X,Y互为相反数,且(X+Y+3)(X-Y-2)=0,求X,Y的值? 若根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x 1.若2x-3y=0,则x+y/x-y(是个分数额)=( ) 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-3y=0,求5x+4y/3x-2y 若2x平方+3xy-2y平方=0,求x+y/x-y 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 若|x+2y-1|+y²+4y+4=0,求（2x-y）²-2（2x-y)(x+2y)+(x+2y)&