若2X-3Y=5,则6-4X+6Y=( )
若5x+3y=3x+4y=x+2y+6,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|5x+2y-12|+(3x+2y-6)(3x+2y-6)=0,则2x+4y=
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²
已知x-5y=0(y≠0),则代数式2x-3y/3x+6y