x-2y-z=1,z+4y+3z=1,x+4y+z=5方程的解

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x-2y-z=1,z+4y+3z=1,x+4y+z=5方程的解
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x-2y-z=1,z+4y+3z=1,x+4y+z=5方程的解
x-2y-z=1,z+4y+3z=1,x+4y+z=5方程的解

x-2y-z=1,z+4y+3z=1,x+4y+z=5方程的解
解方程组
x-2y-z=1,……………………………………………………①
x+4y+3z=1,…………………………………………………②
x+4y+z=5……………………………………………………③
②－③,得 2z = - 4
即,z = - 2
把z = -2代回①、②,得
x - 2y = - 1
x + 4y = 7
解得 ,x=5/3,y=4/3
∴原方程组的解为 x=5/3,y=4/3,z = -2

z+4y+3z=1是否是x+4y+3z=1
如果是：
(1) x-2y-z=1
(2) x+4y+3z=1
(3) x+4y+z=5
(1)*2+()3,得：
3x-z=7(4)
(2)-(3),得：
2z=-4
z=-2
带入(4)得：
x=5/3

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z+4y+3z=1是否是x+4y+3z=1
如果是：
(1) x-2y-z=1
(2) x+4y+3z=1
(3) x+4y+z=5
(1)*2+()3,得：
3x-z=7(4)
(2)-(3),得：
2z=-4
z=-2
带入(4)得：
x=5/3
x=5/3,z=-2带入(1)得：
y=4/3

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x+y+z=6 x+2y+3z=14 y+1=z 已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=? 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 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 matlab解对数方程组[x,y,z]=solve('0.29744*x/(3+0.1*x+y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)))^2','0.79*x/(3+0.1*y+z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.1*y+z)))^2','1.25*x/(3+0.1*z)=(log10((3+x+y+z)/(3+0.1*x+y+z)*(3+y+z)/(3+0.*1y+z)*(3+z)/ x-y-z=1 2x+y-3z=4 3x-2y-z=-1 4x+y+z=-3 2x+3y-4z=-10 x+2y-z=-1 x+y+z=2 4x+2y+z=4 2x+3y+z=1 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=-5,3x+y+z=1,4x+3y+2z=-2快 3x+2y+z=4 x+y+z=10 2x+3y-z=1 x+y-z=6 x-3y+2z=1 3x+2y-z=4 3X+Y+Z=0,2X-Y+3Z=1,X+2Y-Z=4 3x-y+2z=-1 4x+y+z=5 x-2y-z=-2 {3X+2Y+Z=4X+Y+Z=102X+3Y-Z=1 x+y-z=6 x-3y+2z=1 3x+y-z=4