若2x+2y=36,则（x+y):(3+?)

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=( ) 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3x-4y=0,则x/y=______,（x-y)/y=______,（3x+2y)/(2x+3y)=_____. 设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于 若2x+3y=2004,则代数式2(3x-2y)-(x-y)+(-x+9y)=... 若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y= 若2x+y=2012,则代数式2(3x-2y)-(x-y)+(-x+9y)= 若5x+3y=3x+4y=x+2y+6,则x+y=___ 若x/y=4/3 则3x+2y/2x-5y= 若x+3y=3x+2y=7,则x+y=几? 1.若2x-3y=0,则x+y/x-y(是个分数额)=( )