将x+3y=5y,y-2z=5,x+z=5,
来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/24 00:56:26
将x+3y=5y,y-2z=5,x+z=5,将x+3y=5y,y-2z=5,x+z=5,将x+3y=5y,y-2z=5,x+z=5,x=2yy-2z=52y+z=5y-2z=2y+zy=-3z-3z-
将x+3y=5y,y-2z=5,x+z=5,
将x+3y=5y,y-2z=5,x+z=5,
将x+3y=5y,y-2z=5,x+z=5,
x=2y
y-2z=5
2y+z=5
y-2z=2y+z
y=-3z
-3z-2z=5
z=-1
y=3
x=6
x=8 y=-1 z=-3
第一个错了，是x+3y=5
x+3y=5 (1)
y-2z=5 (2)
x+z=5 (3)
(1)-(2)
3y-z=0 (4)
(4)×2-(2)
5y=-5
y=-1
z=3y=-3
x=5-z=8
所以
x=8,y=-1,z=-3
x=6，y=3，z=-1
由题意，得
x=2y;y-2z=5;x+z=5
把x=2y代入方程组，得
y-2z=5;2y+z=5
即y-2z=5;4y+2z=10
解得y=3;z=-1
所以 x=6
y=3
z=-1
将x+3y=5y,y-2z=5,x+z=5,
x/2=y/3=z/5 x+3y-z/x-3y+z
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
x+y+z=35 2x-y=5 y/3=z/2 求x,y,z
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
已知x/y+z=y/x+z=z/x+y,分式(x+2y+3z)/(2x+5y-2c)有意义时的值
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
x+y=5 2x+3y-z=9 x-y+z=4
x+2y+3z=23 y-z=5 x+2z=10
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)
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z)
已知z、y、z同时满足x+3y-5z=0,2x-y-3z=0,求x:y:z
(x+y):(y+z):(z+x)=3:4:5 3x+y-z=-4已知(x+y):(y+z):(z+x)=3:4:5 ；3x+y-z=-4求x y z