X-7Y+3Z=17和5X-6Y-Z=24和3X+7Y-2Z=1怎么解?
X-7Y+3Z=17和5X-6Y-Z=24和3X+7Y-2Z=1怎么解?
解方程组x+2y-z=1 ,3x-3y+z=2,2x+3y+z=7和方程组x+y=-14,y+z=-7,x+z=19
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
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
2x 6y z=7和3x 9y z=8求x y z=几解二愿以此方程,我知道x y
已知方程组{4x-3y-6z=0 x+2y-7z=0 且z≠0,则(x+y+3z)÷(4x-y-5z)=?结果和思路!
2x+5y+4z=6,3x+y-7z=-4,x+y-z=?
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
已知3x+7y+z=315和4x+10y+z=420,求x+y+z
x-y-z=-1 3x+5y+7z=11 4x-y+2z=-1 分别求出x=?y=?z=?
2x+4y+3z=9 3x-2y+5z=11 5x-6y+7z=13 这个方程怎么解?