作业帮5x+y-2z=17 2x-3y+7z=8 6x+2=3(y+6z) 怎么求啊
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5x+y-2z=17 2x-3y+7z=8 6x+2=3(y+6z) 怎么求啊
5x+y-2z=17 2x-3y+7z=8 6x+2=3(y+6z) 怎么求啊
5x+y-2z=17 2x-3y+7z=8 6x+2=3(y+6z) 怎么求啊
三个方程三个未知数啊~很好解的呀：
5x+y-2z=17(1) 2x-3y+7z=8(2) 6x+2=3(y+6z)(3)
(3)+(2)得Z=8X-6,带入（1）可得Y=5+11X,再把Z=8X-6 Y=5+11X带入（2）或者（3）就可解得X,解出X,Y Z就根据Z=8X-6 Y=5+11X出来了,具体你自己算吧~
x/2=y/3=z/5 x+3y-z/x-3y+z
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
..1.x+y+z=26,2.4y+3z=7,y-z=1,3x+2z=17,x+2y-z=18 9x-7y=173.x-7y+3z=17 4.2x+4y+3z=95x-6y-z=24 3x-2y+5z=113x+7y-2z=1 5x-6y+7z=131.x+y+z=26,y-z=1x+2y-z=18 2.4y+3z=7,3x+2z=11,9x-7y=17 3.x-7y+3z=17 5x-6y-z=24 3x+7y-2z=14.2x+4y+3z=93x-2y+5z=11 5x-6y+7z=13
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
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
若X:Y:Z=5:6:7那么(Y-X):(Y+Z)和(X+2Y+3Z):(3X+2Y+Z)
x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2
x+2y+4z=17 2x+y+z=7 3x+y+2z=11
2x-3y-z=-6 7x-y+2z=-17 x-y+z=-6
3x-y=-7,y+2z=2,2x-2z=-5 求x,y,z
x+y+z=0,3x-2y-2z=5,y-z=2x-7
X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
3x+7y+4z=35,x+5y+2z=40,x+y+z=( )
{x+y+z=1 {x+3y+7z=-1 {x+5y+8z=2
{x+y+z=1 {x+3y+7z=2 {x+5y+19z=4
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z