作业帮2x+4y+3x=9 3x-2y+2z=11 5x-6y+7z=13
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/24 07:06:58
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2x+4y+3x=9 3x-2y+2z=11 5x-6y+7z=13
2x+4y+3x=9 3x-2y+2z=11 5x-6y+7z=13
2x+4y+3x=9 3x-2y+2z=11 5x-6y+7z=13
5x+4y=9.(1)
3x-2y+2z=11.(2)
5x-6y+7z=13.(3)
(2)x7-(3)x2:
21x-14y+14z=77.(4)
10x-12y+14z=26.(5)
(4)-(5)去z得
11x-2y=51.(6)
(6)x2+(1)去y得
x=111/27.(7)
把x代入（6）得
y=-26/9.(8)
把x,y代入（2）或（3）得
z= -20/9
所以,x=111/27,y=-26/9,z= -20/9
不知对否,有待验证哦~
x+y=5 2x+3y-z=9 x-y+z=4
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
三元一次方程x+y+z=0 4x+2y+z=3 9x+3y+z=6x+y+z=04x+2y+z=3 9x+3y+z=6
解方程 x+y+z=0 4x+2y+z=3 9x-3y+z=28解方程x+y+z=04x+2y+z=39x-3y+z=28
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
2x+z=10 x+y-z=4 3x-y-z=0
已知:2X-3y+2z=0,x+4Y-9/2z=0求:X:Z的值.X:y:Z的值.X+2y+X/X+y+Z的值. 已知:2X
2x+y-z=2 x-y+2z=2 3x+2y+4z=9
2x+y-z=2 x-y+2z=2 3x+2y+4z=9
解方程组 x+y+z=5 2x-y-z=4 3x-2y-z=9
{x+y+z=0 {4x+2y+z=3 {9x+2y+z=6
{x+y+z=0 4x+2y+z=3 9x+3y+z=6
x+y+z+2,4x+2y+z+2,9x+3y+z=6解方程组