若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
设x>1,y>0,若x^y+x^-y=2根号2,则x^y-x^-y等于
若3x=4y,则x:y等于
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若/x+y-2/+(2x-3y+6)的平方等于0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
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
若2x+5y+4z=6,3x+y-7y=-4,则x+y-z等于多少
已知x+y=6,x-y=5,则x^2-y^2等于多少
x-y/3=x+y/2 2x-5y=7等于多少
已知3x-3=2y-3,则x-y/x+y等于多少
若5x+3y=3x+4y=x+2y+6,则x+y=___