若2x=4y-1,27y=3x+1,则x-y等于( )
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
已知x+y+2(-x-y+1)=3(1-y-x)-4(y+x-1),则x+y等于( )
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若(1+X)²+Y+1的绝对值=0 则4x-3y分之2x-y等于?
若3x=4y,则x:y等于
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
若实数X Y满足{X-Y+1大于等于0 X+Y大于等于0 X小于等于0则Z=X+2Y的最大值?
若实数X Y满足y=2x+1,且x小于等于2y大于等于3,则y/x的取值范围是 ?
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x=-1/4,能否确定代数式(2x-y)(2x+y)+(2x-y)(y-4x)+2y(y-3x)的值?
方程(3x+1)-(y+z)=x+y,若用含x代数式表示y,则y等于几