2x+y+3z=5 3x-2y-z=6 4x-3y+2z=4

来源：学生作业帮编辑：大师作文网作业帮分类：数学作业时间：2024/11/13 01:21:33

2x+y+3z=5 (1)
3x-2y-z=6 (2)
4x-3y+2z=4 (3)
(1)×2+(2) 7x+5z=16 (4)
(2)×3+(3) 10x+11z=19 (5)
相减 3x+6z=3 x+2z=1 x=1-2z
代入上式(5) 7-14z+5z=16 9z=-9 z=-1
x=3
y=2

{2x+3y-4z=-5 x+y+z=6 x-y+3z=10 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z 已知x/4=y/5=z/6 求x+y+z/3x-2y+z的值已知x/4=y/5=z/6,求x+y+z/3x-2y+z的值. 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：z=3：4：5,(1)求x+y分之z的值；（2）若x+y+z=6,求x,y,z. x/2=y/3=z/5 x+3y-z/x-3y+z x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, 1.x+y=16,y+z=12,z+x=102.3x-y+z=4,2x+3y-z=12,x+y+z=63.x+y+z=6