5.｛7x+2y-z=7 ① 6.{9x+4y+z=10 ①{6x-y+z=7 ② {-9x+2y+3z=-6 ②{4x+3y+z=9 ③ {3x-4y+2z=5 ③ x=1,y=1,z=2 x=1,y=0,z=1

5.｛7x+2y-z=7 ① 6.{9x+4y+z=10 ①{6x-y+z=7 ② {-9x+2y+3z=-6 ②{4x+3y+z=9 ③ {3x-4y+2z=5 ③ x=1,y=1,z=2 x=1,y=0,z=1 三元一次方程解 1.{x+y-z=5 {3x+2y+z=2 {2x-2y+z=-31.{x+y-z=5 2.{9x-5y+x=-6 3.{x-y=3 4.{x+y=3 5.{4x-2y+z=7{3x+2y+z=2 {9x+y-2z=3 {x+z=7 {y+z=4 {2x-y-3z=28{2x-2y+z=-3 {-9x+3y-5z=0 {y-z=6 {z+x=5 {x+y-2z=13 x+y+z=14 7z=x+y+2 x+z=y 方程组 2x+y+z=7,x+2y+z=8,x+y+2z=9 快 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 6x+3y-2z=108,9x+7y-3z=212,3x-2y+5z=38,求x,y,z 解方程组 2x+y+z=7 x+2y+z=8 x+y+2x=9 三元一次方程：x+3y+2z=2 3x-y+2z=3 3x+2y-4z=3 2x+y-3z=11 2x-y=7 x+y+z=12还有：7x+2y-z=76x-y+z=74x+3y+z=9 好了,2x+y-3z=11 2x-y=7x+y+z=12 (1)x-2y=-9,y-z=3,2z+x=47.(2)3x-y+z=4,2x+3y-z=12,x+y+z=6.(3)x+2y=4,2x+3x=13,3y+z=6.(4)5x+6y+2z=80,4x-3y+z=16,3x-2y+6z=92.(5)x:y=5:3,x:z=7:2,x-3y+3z=4每个都是方程组，我不会打大括号顺便告诉我方法是什么 （3）的方程打错了 2x+4y+3z=9① 3x-2y+5z=11② 5x-6y+7z=13③ 2x+4y-3z=9① 3x-2y-4z=8② 5x-6y-5z=7③ ..1.x+y+z=26,2.4y+3z=7,y-z=1,3x+2z=17,x+2y-z=18 9x-7y=173.x-7y+3z=17 4.2x+4y+3z=95x-6y-z=24 3x-2y+5z=113x+7y-2z=1 5x-6y+7z=131.x+y+z=26,y-z=1x+2y-z=18 2.4y+3z=7,3x+2z=11,9x-7y=17 3.x-7y+3z=17 5x-6y-z=24 3x+7y-2z=14.2x+4y+3z=93x-2y+5z=11 5x-6y+7z=13 fangchengzu:X+Z=Y 7Z=X+Y+Z X+Y+Z=14 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. 解下列三元一次方程组:(1)x-z=4,x+y-z=-1,2y-z=1 (2)3x+4z=7,2x+3y+z=9,x-y+z=8 六年级三元一次方程组.解下列方程组：(1)5x-3y+z=25x+2y-4z=3-5x+y-z=2(2)x-y-z=-13x_5y+7z=114x-y+2z=-1(3)9x-5y+z=-69x+y+4z=3-9x+3y-5z=0(4)x+y=22x+z=-27y+z=13 int x,y,z; x=2; y=4; z=7; x=y--