9x+4y+z=10-9x+2y+3z=-63x-4y+2z=5这个方程组怎么解
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/26 11:24:49
9x+4y+z=10-9x+2y+3z=-63x-4y+2z=5这个方程组怎么解9x+4y+z=10-9x+2y+3z=-63x-4y+2z=5这个方程组怎么解9x+4y+z=10-9x+2y+3z=
9x+4y+z=10-9x+2y+3z=-63x-4y+2z=5这个方程组怎么解
9x+4y+z=10
-9x+2y+3z=-6
3x-4y+2z=5
这个方程组怎么解
9x+4y+z=10-9x+2y+3z=-63x-4y+2z=5这个方程组怎么解
9x+4y+z=10.(1)
-9x+2y+3z=-6.(2)
3x-4y+2z=5.(3)
(1)+(2):6y+4z=4.(4)
(3)*3+(2):-10y+9z=9.(5)
(4)*5+(5)*3:20z+27z=47
z=1
代入(4)
6y+4=4
y=0
代入(1)
9x+0+1=10
x=1
所以x=1 y=0 z=1
1式和2式相加得:6Y+4Z=4 (4式)
2式和3式乘以三,相加得:-10Y+9Z=9 (5式)
4式乘以5 得:30Y+20Z=20
5式乘以3 得:-30Y+27Z=27
上面两式相加得:47Z=47 所以Z=1
把Z=1代入4式得:Y=0
把Y=0,Z=1 代入1式得:X=1
所以解得:X=1,Y=0,Z=1
X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z
三元一次方程组,1.x-2y+z=9 2x+y+3z=10 3x+2y1.x-2y+z=92x+y+3z=103x+2y-z2.3x-5y+2z=14x+5y-z=5X-5y+3z=-23.7x+2y-z=76x-y+z=74x+3y+z=94.4x+3y-2z=-75x-6y+z=12x+z=-25.2x+3y-4z=-23x-2y+5z=262x+5z=31
x+y=5 2x+3y-z=9 x-y+z=4
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
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
2x+z=10 x+y-z=4 3x-y-z=0
方程组3x+y+2z=10,2x+3y-z=9,x+y+z=6
2x+y-z=2 x-y+2z=2 3x+2y+4z=9
2x+y-z=2 x-y+2z=2 3x+2y+4z=9
{x+y+z=0 4x+2y+z=3 9x+3y+z=6
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
2x+3y-z=9,x+y+z=15,5x-4y-z=0
x+y+z+2,4x+2y+z+2,9x+3y+z=6解方程组
正数x,y,z满足5x+4y+3z=10求证25x^2/(4y+3z)+16y^2/(3z+5x)+9z^2/(5x+4y)>=5
2x+3y+z=13 4x^2+9y^2+z^2-2x+15y+3z=82 求x,y,z
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?