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
收起
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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