解 2X+Y +3Z=1 3X-2Y+2Z=2 -4X+4Y-Z= -1
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/16 06:47:25
解 2X+Y +3Z=1 3X-2Y+2Z=2 -4X+4Y-Z= -1
2X+Y +3Z=1 (1)
3X-2Y+2Z=2 (2)
-4X+4Y-Z= -1 (3)
(1)*2+(2)得
7X+8Z=4 (4)
(2)*2+(3)得
2X+3Z=3 (5)
(4)*2-(5)*7得
Z=2.6
代入(5)得
X=-2.4
代入(1)得
Y=-2
X=-12/5
Y=-2
Z=13/5
y=-0.08
x=0.09
z=0.96
X=-12/5
Y=-2
Z=13/5
2X+Y +3Z=1 (1)
3X-2Y+2Z=2 (2)
-4X+4Y-Z= -1 (3)
(1)*2+(2)得
7X+8Z=4 (4)
(2)*2+(3)得
2X+3Z=3 (5)
(4)*2-(5)*7得
Z=2.6
代入(5)得
X=-2.4
代入(1)得
Y=-2y=-0.08
x=0.09
z=0.96
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)/
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
分式加减的几道题目求速度1 .(x+y)²/(x-z)(y-z) - (y+z)²/(x-z)(y-z) = 2.2x+3y/x-y+2y/y-x-3y/x-y=
x+y+z=6 x+2y+3z=14 y+1=z
解方程组 x+y+z=2 x-2y+z=-1 x+2y+3z=-1
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组 :X+Y-3Z=1 Y+Z-3X=2 Z+X-3Y=3
解方程:x+z=y (1) ,7z-(x+y)=2 (2) ,x+y+z=14 (3)
解方程组:x:y:z=1:2:3;x+y+z=12,求,x,y,z的值
解三元一次方程组 ①2x-y+z=1 3x+y -2z=2 X+2y-z=3 ②x-4y+z=-3 2x+Y-Z=18 X-Y-Z=7 ③4x+4y+2z=7 6X-4y-z=6 2x-y+z=1
若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值
解三元一次方程组1、x+y-z=4 2x-y+z=5 x-3y+z=-2 2、y+2z=-2 3x+y-4z=1 2x-y+2z=8 3、x-2y+z=-1 x+y+z=2x+2y+3z=-1
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
x/2=y/3=z/5 x+3y-z/x-3y+z
x+2y=3x+2z=4y+z 求x:y:z