x-2y+z=5 ① x-y=2 ② 2x+3y+z=1③
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)
{5X+Y+Z①X+5Y+Z=-2②X+Y+5Z=10③
{x+y+z=1;x+3y+7z=-1;z+5y+8z=-2
{5x+2y-4z=1① 3x-3y+2z=1② -2x+3y-2z=0③}
x+y+z=2 ① 2x+3y+z=38 ① x+y=3 3x-y-4z=5 ② 3x+4y+2z+56 ② y+z=5
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
已知x/2=y/4=z/7,求①x:y:z.②若2x+y+3z=58,分别求x,y,z的值.③求x+y/x+z的值.
x+y+z=2 x-3y+2z=1 2x+2y+z+5 要具体步骤..
3x+2y+z=14 ,x+y+z=10,z+2x+3y=1 5
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
1.解下列方程组,①y-2z=1,x+3z=-1,3x-5y+z=21.②x+y+2z=7,x-2y-z=-4,2x+3