2x+3y-z=11 2x+y-5z=8 -2x+7y+z=19 怎么求!简洁一些~
2x+3y-z=11 2x+y-5z=8 -2x+7y+z=19 怎么求!简洁一些~
2x+3y-z=11 2x+y-5z=8 -2+7y+z=19
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z
已知2x+5y+4z=6 3x+y-7z=-4求x+y-z
x/2=y/3=z/5 x+3y-z/x-3y+z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
x+2y+3z=14 2x+y+z=7 3x+y+2z=11 求x y z
已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值
三元一次方程组 {x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 怎么求
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
x=y/z=z/3,x+y+z =12,求2x+3y+4z是多少,