5x+3y=25 2x+7y-3z=19 3x+2y-z=18

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：2024/11/12 07:38:37

(3)×3-(2)得
7x-y=35 (4)
(4)×3+(1)得
12x=60
∴x=5
把x=5代入(1)得
y=0
把x=5,y=0代入(3)得
15+0-z=18
∴z=-3
∴方程组的解是
x=5
y=0
z=-3

5x+3y=25,2x+7y-3z=19,3x+2y-z=18,求x,y,z的值 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) 2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X {x+y+z=1;x+3y+7z=-1;z+5y+8z=-2 2x+3y-z=11 2x+y-5z=8 -2+7y+z=19 2x+5y+4z=0,3x+y-7z=0,则x+y-z=? 2x+5y+4z=6,3x+y-7z=-4,x+y-z=? 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z 已知2x+5y+4z=6 3x+y-7z=-4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+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值