作业帮{x+y+z=1 {x+3y+7z=2 {x+5y+19z=4
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{x+y+z=1 {x+3y+7z=2 {x+5y+19z=4
{x+y+z=1 {x+3y+7z=2 {x+5y+19z=4
{x+y+z=1 {x+3y+7z=2 {x+5y+19z=4
(2)-(1):2y＋6z=1(4)
(3)-(1):4y＋18z=3(5)
(4)×2:4y＋12z=2(6)
(5)-(6):6z=1 z=1/6
(4)×3:6y＋18z=3(7)
(7)-(5):2y=0 y=o
将y=0,z=1/6带入（1） 得x=5/6
解方程组
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{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
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=6 x+2y+3z=14 y+1=z
x+Y+Z=1 X+3Y+7Z=-1 X+5Y+8Z=2x+Y+Z=1X+3Y+7Z=-1X+5Y+8Z=2
(1)X+Y=15,Y+Z=-6,Z+X=7.(2)X+Y=-14,Y+Z=-7,Z+X=9.(3)X+Y=0,Y+Z=-1,Z+X=-1.
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+2y-z=1 3x-3y+z=2 3x+3y+z=7
{x+y+z=1 {x+3y+7z=-1 {x+5y+8z=2
解方程：x+z=y (1) ,7z-(x+y)=2 (2) ,x+y+z=14 (3)
{x+y+z=1 {x+3y+7z=2 {x+5y+19z=4
1.{x:y:z=3:4:5 2x+3y-5z=-142.{x-y-z=-1 3x+5y+7z=11 4x-y+2z=-13.{x+y=1 x+z=0 2x+y+2z=44.{x-y+z=-3 2x-y-z=-2 -3x+y+z=-15.{x-y+z=-3 3x+y-4z=6 2x+y-z=36.{x-2y+5z=16 2x+y-5z=7 2x-y+z=38
若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值
x：y：z=1：2：7 2x-y+3z=21 x：y：z=1：2：7 2x-y+3z=21
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
三元一次方程 X-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 X=?Y=?Z=?
解三元一次方程组 ①2x-y+z=1 3x+y -2z=2 X+2y-z=3 ②x-4y+z=-3 2x+Y-Z=18 X-Y-Z=7 ③4x+4y+2z=7 6X-4y-z=6 2x-y+z=1