3X+2y+z=20 x+y+z=10 Y=3X
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3X+2y+z=20 x+y+z=10 Y=3X
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
x+y-z=5,2x+3y+z=10,x-2y-z=20求方程组
x+y-z=5 2x+3y+z=10 x-2y-z=20 速解,
X=3z X+y+z=12 X+2y-2z=10
2x+z=10 x+y-z=4 3x-y-z=0
求{x+y-z=5；2x+3y+z=10；x-2y-z=20中x、y、z的值,
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
x+2y+3z=23 y-z=5 x+2z=10
证明 ：x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
x/2=y/3=z/5 x+3y-z/x-3y+z
x+y/2=z+x/3=y+z/4 x+y+z=27
若x+y+z=3y=2z,则x/x+y+z=?
x+2y=3x+2z=4y+z 求x:y:z
{2x+y=10 {x-y+z=4 {3x-y-z=0