7.｛4x+3y-2z=-7 ① 8.｛5x-3y+6z=-3 ①{5x-6y+z=1 ② {3x-y+3z=0 ②{2x+z=-2 ③ {y+3z=6 ③x=-1,y=-1,z=0 x=-3,y=0,z=2

解三元一次方程组 ①2x-y+z=1 3x+y -2z=2 X+2y-z=3 ②x-4y+z=-3 2x+Y-Z=18 X-Y-Z=7 ③4x+4y+2z=7 6X-4y-z=6 2x-y+z=1 7.｛4x+3y-2z=-7 ① 8.｛5x-3y+6z=-3 ①{5x-6y+z=1 ② {3x-y+3z=0 ②{2x+z=-2 ③ {y+3z=6 ③x=-1,y=-1,z=0 x=-3,y=0,z=2 ①5x-4y+4z=132x+7y-3z=193x+2y-z=18②y=2x-75x+3y+2z=23x-4z=4 已知x/2=y/4=z/7,求①x：y：z.②若2x+y+3z=58,分别求x,y,z的值.③求x+y/x+z的值. 三元一次方程求解：①x+2z=3,2x+y=2,2y+z=7.②x+y+z=2,3x-y-4z=5,2x+3y-2z=0. 已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值 已知4x-3y-6z=0 ① ,x+2y-7z=0 ②,且x,y,z均不为0,求3x+2y+z÷x+2y+3z的值 (1)X+Y=15,Y+Z=-6,Z+X=7.(2)X+Y=-14,Y+Z=-7,Z+X=9.(3)X+Y=0,Y+Z=-1,Z+X=-1. 解方程：{2x+3y+z=7,x+y+z=4,3x+y-z=-4{2x+3y+z=7,x+y+z=4,3x+y-z=-4要过程 解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7. 解方程组x+y/2=z+x/3=y+z/4①x+y+z=27② x：y：z=3:4:7 2x-3y+z=18 求：3x-2y+z x+2y+4z=17 2x+y+z=7 3x+y+2z=11 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 X-Y-Z=0 X+Y-3Z=4 2X-5Y+7Z=21 3x+7y+4z=35,x+5y+2z=40,x+y+z=( ) {x+y+z=1 {x+3y+7z=2 {x+5y+19z=4