{2x+3y+4z=16,3x-2y+5z=8,5x-6y+7z=4 急用!

来源：学生作业帮编辑：神马作文网作业帮分类：数学作业时间：2024/11/17 09:15:48

2x+3y+4z=16,①
3x-2y+5z=8 ②
5x-6y+7z=4 ③
2 ①+ ③： 9X+15Z=36 ④
3 ② - ③：4X+8Z=20 ⑤
4④-9⑤：-12Z=-36
Z=3
Z=3 带入④得：X=-1
Z=3 ,X=-1带入①得：Y=2
X=-1,Y=2,Z=3

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 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z 2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X 三元一次方程组2x+z=3 3x+y-z=8 x+3y+2z=3 5x+2y-3z=2 x+2y+z=6 7x-2y-4 若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai {2x+3y-4z=-5 x+y+z=6 x-y+3z=10 2x+5y+4z=0,3x+y-7z=0,则x+y-z=? 解方程组：x+y+z=4,x+y+2z=5,3x+y-z=6 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.