超简单 解方程3x+2y+z=13 x+y+2z=7 2x+3y-z=12
超简单 解方程3x+2y+z=13 x+y+2z=7 2x+3y-z=12
3x-y+z=3 2x+y-3z=11 x+y+z=12 解方程
解方程{3x -y+z=4 2x+3y-z=12 x+y+z=6
解方程:{2x+3y+z=7,x+y+z=4,3x+y-z=-4
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 3x+2y+z=13 x+5y+2z=7 2x+3y-z=12
解方程x+y+2z=7① 2x+3y-z=12② 3x+2y+z=13③
解方程x+y+2z=7 2x+3y-z=12 3x+2y+z=13 时宜先消去未知数
1.x+y+z=21,x-y=1,2x+z-y=13.2.3x+2y+z=13,x+y+2z=7 ,2z+3y-z=12
3x+2y+z=13 x+y+2z=7 2x+3y-z=12 x=?y=?z=?
{3x+2y+z=13 x+y+2z=7 2x+3y-z=12,求x,y,z
matlab解方程怎么出错了[x,y,z]=('x^2-5*y^2+7*z^2+12=0 ','3*x*y+x*z-11