x+y-z=6,x-3y+2z=1,3x+2y-z+8的过程和解

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x+y-z=6,x-3y+2z=1,3x+2y-z+8的过程和解
x+y-z=6,x-3y+2z=1,3x+2y-z+8的过程和解

x+y-z=6,x-3y+2z=1,3x+2y-z+8的过程和解
根据第一公式x+y-z=6则 ,x+y=6+z ,x=6+z-y
根据第二公式x-3y+2z=1则 ,x-3y=1-2z ,x=1-2z+3y
组合第一第二公式6+z-y=1-2z+3y ,z-y+2z-3y=1-6,3z-4y=-5 ,4y=3z+5 ,y=(3z+5)/4
最后一组方程式我当你是3x+2y-z=8,把x=6+z-y和y=（3z+5）/4带入则得到等式
3*[6+z-（3z+5）/4]+2[(3z+5)/4]-z=8
18+3z-3*（3z+5）/4+（3z+5）/2-z=8
18+2z-2.25z-3.75+1.5z+2.5=8
1.25z=8-16.75
z=-7
把z=-7带入y=（3z+5）/4则得y=-4,
把z=-7,y=-4带入x=6+z-y则得x=3
答：x=3,y=-4,z=-7

x+y+z=6 x+2y+3z=14 y+1=z 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) 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 (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. 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 x+y-z=6 x-3y+2z=1 3x+2y-z=4 阿 x+y-z=6,x-3y+2z=1,3x+2y-z=4 x+y-z=6 x-3y+2z=1 3x+2y-z=4 x=2y-9z x+2y-3z=2 x-2y+6z=1 x+y-z=6 x-3y+2z=1 3x+y-z=4 x-y+z=-1 5x+2y-z=6 4x-3y+2z=-5 x+y+z=1 4x+5y-z=6 x+2y-z=3 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 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 x+y-z=6(1) x-3y+2z=1(2) 3x+2y-z=4(3) 求X Y Z 的值解三元一次方程组 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