1. 若3x=1/7y,则x:y=( ):( )
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若3x=7y,则y分之x= ,x:(x:y)=
若3x=7y,则y比x= ,x:(x+y)=
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(
1.已知1/x+1/y=-1/x+y,则y/x+x/y=?
若3X=7Y,则X:Y=?
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
若x,y满足|2x-y-3|+|3x+2y+1|=0,则x= y=
若x+7y=y-3x,求x
若x+3y=3x+y=-7则x+y=