解方程:x+y+z=0 ① 4x+2y+z=3 ② 9x+3y+z=6 ③
解方程:x+y+z=0 ① 4x+2y+z=3 ② 9x+3y+z=6 ③
解方程一;{x+y-z=6,x-3y+2z=1,3x+2y-z=-7.②{3x+4z=7,2x+3y+z=9,5x-9y
解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6
①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-
解关于w,x,y,z的方程w+8x+3y+5z=20①,4w+7x+2y+3z=-20②,6w+3x+8y+7z=20③
解方程:{2x+3y+z=7,x+y+z=4,3x+y-z=-4
解方程{①2x-y+z=6②-3x+2y-z=-9③x+y-2y=-1
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
3元1次方程x-2y=-9 3x-y+z=4{ y-z=3 { 2x+3y-z=122z+x=47 x+y+z=6
解三元一次方程组:x+y-z=0 ① 3x+y=6 ① 2x-y+3z=2 ② x+2y-z=5 ② x-4y-2z+6
解方程x+y+2z=7① 2x+3y-z=12② 3x+2y+z=13③
解方程x-y+z=5,①2x+y-3z=15②,3x-2y+z=16③