3x-5y+2z=1 4x+5y-z=5 x-5y+3z=-2

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/26 02:22:04

3x-5y+2z=1 (1)
4x+5y-z=5 (2)
x-5y+3z=-2 (3)
(1)+(2)得7x+z=6 (4)
(2)+(3)得5x+2z=3 (5)
(4)X2-（5）得9x=9 .所以x=1
将x=1代入（4）得z=-1
将x=1、z=-1代入（1）得y=0
即此题结果：x=1、y=0、z=-1

x/2=y/3=z/5 x+3y-z/x-3y+z {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=? 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. {5x-3y+z=2{5x+2y-4z=3{-5x+y-z=2 {x-y-z=-1{3x+5y+7z{4x-y+2x=- 已知x:y:z=4:5:7,求:(1)2x+3y+z/5z; (2)x+y/y+z. (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai 3x+2y+z=14 ,x+y+z=10,z+2x+3y=1 5 {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? x+y+z=2 x-3y+2z=1 2x+2y+z+5 要具体步骤.. 已知x:y:z=3:4:5,3x+2y-4z=18.求：x+y+z.