已知x/2=y/3=z/-1≠0,求分式2x+6y-3z/x+y+2z的值

已知x/2=y/3=z/-1≠0,求分式2x+6y-3z/x+y+2z的值 分式加减法：已知x+y/z=x+z/y=y+z/x(x+y+z≠0）,求x+y-z/x+y+z 已知x/3=y/4=z/5,求分式x+y/x-2y+3z的值 一道有关分式性质的题目!已知3x=2y=5z不等于0,求x+2y+3x/x-y+z 值 一条分式数学题已知x y z满足x/x+y + y/z+x + z/x+y =1,求x²/x+y + y²/z+x + z²/x+y的值.3Q 已知3x=4y=6z,求分式x+y-z/x-y+z的值急 已知3x=4y=6z,求分式x+y-z/x-y+z 已知（Y+Z）/X=(Z+X)/Y=(X+Y)/Z(X+Y+Z≠0)求分式（X+Y-Z）/(X+Y+Z)的值 代数式的恒等变形3已知（x+y+-z）/z=(x-y+z)/y=(-x+y+z)/x且xyz不等于0求分式（x+y)(y+z）(z+x)/xyz的值 分式加减的几道题目求速度1 .(x+y)²/（x-z)(y-z) - (y+z)²/（x-z)(y-z) = 2.2x+3y/x-y+2y/y-x-3y/x-y= 已知X,Y,Z是三个非零数,且X:Y:Z=4:3:1,求分式2X-3Y+5Z除于X+y+Z的值 已知x/2=y/3=z/5,求分式2x+3y-z/3x-2y+z 已知x/3=y/4=z/5 求 分式y^2+z^2-x^2/x^2+z^2-y^2 已知 x/2=y/3=z/4 求分式2x+y-3z/x-y+2z的值 试一试:已知X/3=Y/4=Z/6不等于0,求分式X+Y-Z/X-Y+Z的值K怎么来！ 已知x/2=y/3=z/0.5,求分式x+3y-z/2x-y+z的值 现有一道题,已知x/2=y/3=z/4,求分式(x+2y-z)/(x+y-3z) 已知x/2=y/3=z/4,试求x+y-z/x+y+z的值初二分式里的题