x+2y-z=3,2x-3y+2z=5,x+y=5解方程组
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/03 11:48:22
x+2y-z=3,2x-3y+2z=5,x+y=5解方程组
x+2y-z=3,2x-3y+2z=5,x+y=5解方程组
x+2y-z=3,2x-3y+2z=5,x+y=5解方程组
x+2y-z=3 (1)
2x-3y+2z=5 (2)
,x+y=5 (3)
2(1):2x+4y-2z=6
2(1)+(2):
4x+y=11
y=11-4x
将y=11-4x 代入 ,x+y=5得:
x+11-4x=5
-3x=-6
x=2
y=11-4x=11-4*2=3
将x=2,y=3 代入x+2y-z=3得:
2+2*3-z=3
z=2+2*3-3=5
x=2,y=3,z=5
x/2=y/3=z/5 x+3y-z/x-3y+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x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
x+2y=3x+2z=4y+z 求x:y:z
x+y/2=z+x/3=y+z/4 x+y+z=27
若x+y+z=3y=2z,则x/x+y+z=?
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
x+2y+3z=23 y-z=5 x+2z=10
设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值
已知x/y+z=y/x+z=z/x+y,分式(x+2y+3z)/(2x+5y-2c)有意义时的值
x+y+z=35 2x-y=5 y/3=z/2 求x,y,z
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊
已知z、y、z同时满足x+3y-5z=0,2x-y-3z=0,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