{3x-y+z=3 2x+y-3z=11 x+y+z=1 注意:x+y+z=1 不等于12!
2个回答
①3x-y+z=3
②2x+y-3z=11
③x+y+z=1
①-③ 2x-2y=2 x-y=1
②+3③5x+4y=14
x=2,y=1
则z=-2
相关问题
三元一次方程:3x-y+z=3,2x+y-3z=11,x+y+z=12
3x-y+z=3 2x+y-3z=11 x+y+z=12 解方程
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-y+z=3 2x+y-3x=11 x+y+z=12
解三元一次方程 (1) x-2y=1 (2) x+y-z=11 x=3y y+z-x=5 x-3y+z=8 z+x-y=
解下列方程组3x-y+z=3,2x+y-3z=11,x+y+z=12
3x-y+z=3 2x+y-3z=11 x+y+z=12是连式
(1){x+2y+3z=14① {2x+y+z=7②{3x+y+2z=11③
1.{ 3x-y+z=3 { 2x+y+3=11 {x+y+z=12 求高手解答
x-5y-3z=0 y+z-3x=3 x+y+3z=14 y+4z=3 z+x-3y=5 2x+y+z=7 2x-z=1