①11x+3z=9②2X+2Y+Z=8③2x-6y+4z=5
2x+4y+3z=9① 3x-2y+5z=11② 5x-6y+7z=13③
2x+4y-3z=9① 3x-2y-4z=8② 5x-6y-5z=7③
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
解方程组:3X+4z=7①,2x+3y+z=9② ,5X-9y+7z=8③,,紧急
x/2=y/3=z/5 x+3y-z/x-3y+z
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
解三元一次方程组:(一)2x+y+z=4① x-y+3z=3 ②x+z=2③ 二;①2x+y+z=2 ②x+2y+z=5
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
解方程:x+y+z=0 ① 4x+2y+z=3 ② 9x+3y+z=6 ③
{5X+Y+Z①X+5Y+Z=-2②X+Y+5Z=10③
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?