y＝2x-1 2x+3y+z＝8 3x+2x＝-4 用一元三次方程解

x：y＝9：8 x：z＝3：2求x,y,z的值. x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, |3X-2Y|+√Y-2Z＝0求X/Y+Y/Z+Z/X的值 实数x、y、z同时满足x^3+y=3x+4;2y^3+z=6y+6;3z^3+x=9z+8设实数x、y、z同时满足x^3＋y＝3x＋4；2y^3＋z＝6y＋6；3z^3＋x＝9z＋8,试求2009(x-1)^2＋2010（y-1）^2+2011(z-1)^2的值 已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2 (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 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= 若x+2y-4z＝0 3x+y-z＝0 求x：y：z 已知：x+y+z＝3y＝2z,求x分之x+y+z的值 {x+y+z=1 x-2y+3z=5 2x-3y-3z=-8 {x+2y+z=8{2x-y-z=-3{3x+y-2z=-1 {x+2y+z=8,2x-y-z=-3,3x+y-2z=-1 x+y+z=-1 4x-2y+3z=5 y-z=8-2x