解方程x+y+z=2,3x-y-4z=5 ,2x+3y-2z=0
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解方程x+y+z=2,3x-y-4z=5 ,2x+3y-2z=0
要过程的.O(∩_∩)O谢谢!
要过程的.O(∩_∩)O谢谢!
x+y+z=2 (1)
3x-y-4z=5 (2)
2x+3y-2z=0 (3)
(1)+(2)得
4x-3z=7 (4)
(1)*3-(3)得
3x+3y+3z-2x-3y+2z=6-0
x+5z=6 (5)
(4)*5+(5)*3得
5(4x-3z)+3(x+5z)=7*5+6*3
23x=53
x=53/23
5z=6-x
z=17/23
y=2-x-z=-24/23
所以x=53/23 y=-24/23 z=17/23
3x-y-4z=5 (2)
2x+3y-2z=0 (3)
(1)+(2)得
4x-3z=7 (4)
(1)*3-(3)得
3x+3y+3z-2x-3y+2z=6-0
x+5z=6 (5)
(4)*5+(5)*3得
5(4x-3z)+3(x+5z)=7*5+6*3
23x=53
x=53/23
5z=6-x
z=17/23
y=2-x-z=-24/23
所以x=53/23 y=-24/23 z=17/23
解方程:{2x+3y+z=7,x+y+z=4,3x+y-z=-4
解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6
已知x,y,z,同时满足方程x+3y-5z=0,2x-y-3z=0求x:y:z的值
解方程一;{x+y-z=6,x-3y+2z=1,3x+2y-z=-7.②{3x+4z=7,2x+3y+z=9,5x-9y
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
x/2=y/3=z/5 x+3y-z/x-3y+z
已知2x+3y+z=130,3x+5y+z=180,试求x+2y/z+y+z【在线等高手解方程】
3x-y+z=3 2x+y-3z=11 x+y+z=12 解方程
解方程:x+2y+3z=8 x+3y+5z=6
解方程x+y+z=2,3x-y-4z=5 ,2x+3y-2z=0
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6