①4x-6y=9 ②6y-20z=2 ③4x+6y+20z=113 解方程组①4x-6y=9②6y-20z=2③4x+6y+20z=113解方程组

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 ①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-6=0③x/3=y/2 y/4=z/5 x+y+z=60三元一次方程 2x+4y-3z=9① 3x-2y-4z=8② 5x-6y-5z=7③ 2x+4y+3z=9① 3x-2y+5z=11② 5x-6y+7z=13③ 解方程：x+y+z=0 ① 4x+2y+z=3 ② 9x+3y+z=6 ③ 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 ①4x+9y=12 3y-2z=1 7x+5z=19分子4 ②4x-9z=17 3x+y①4x+9y=123y-2z=17x+5z=19分子4②4x-9z=173x+y+15z=18x+2y+3z=2③2x+4y+3z=93x-2y+5z=115x-6y+7z=13这些是三元一次方程组, 方程组①9x-5y+z=-6 ②9x+y+4z=3 ③-9x+3y-5z=0 初一·三元一次方程组第一题：4x+9y=12①,3y-2z=1②,7x+5z=19/4③.第二题：4x-9z=17①,3x+y+15z=18②,x+2y+3z=2③.第三题：2x+4y+3z=9①,3x-2y+5z=11②,5x-6y+7z=13③. 3x-y-z=9①2x+y-2z=6②x+y+z=15③要过程 解方程组：2x+3y+z=3①,7x+6y+z=4②,x+y+z=7/3③. 解三元一次方程,①{x+y-z=0{ x+2y+z=13{2x-3y+2z=5②｛x+y-z=11｛y+z-x=5｛z+x-y=1③｛x+y=1｛y+z=6｛z+x=3 解3元1次方程组：① {2X-Y+Z=-3 {X+3Y-2Z=13 {3X-2Y-Z=2 ② {2X+4Y+3Z=9 {3X-2Y+5Z=11 {5X-6Y+7Z=13 ③ {X+Y+Z+-2 {5X+4Y+Z=O {3X+Y-4Z=11 ④ {X+Y=3 {Y+Z=5 {Z+X=4 ⑤ 当 Y= AX的平方+BX+C 当 X=1时 Y=-4 当 X=3时 Y=-20 当 X=-1时 Y=-12 求A,B 三元一次方程x+y+z=0 4x+2y+z=3 9x+3y+z=6x+y+z=04x+2y+z=3 9x+3y+z=6 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 解方程{①2x-y+z=6②-3x+2y-z=-9③x+y-2y=-1 ①11x+3z=9②2X+2Y+Z=8③2x-6y+4z=5求x,y,z急～