1、已知x=2y,则x-5y/x+y=()
1、已知x=2y,则x-5y/x+y=()
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
1.已知1/x+1/y=-1/x+y,则y/x+x/y=?
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
已知4x=9y求(1)x+y/y (2)y-x/2x
已知x+y+2(-x-y+1)=3(1-y-x)-4(y+x-1),则x+y等于( )
已知x=1/y,则(x-1/x)(y-1/y)等于 A、2x² B、2y² C、x²+y&
(1)已知x+y=6,x²-y²=5,求x-y的值(2)若x+y=3,x²+y²