解三元一次方程x+y-z=-3,2x+y-3z=-2,3z-y=2z=-11

来源:学生作业帮助网 编辑:作业帮 时间:2024/12/02 03:34:00
解三元一次方程x+y-z=-3,2x+y-3z=-2,3z-y=2z=-11
xN0_)HIE8T/HlʀԎ:]1;3lﳝWaCs|}<:UCSjRBo`V?<xY\m|sߨ)A r sNM.[A`#Zv`TqɢDY,zJ߶q.u C̨PJ%R MuqU| ˣ

解三元一次方程x+y-z=-3,2x+y-3z=-2,3z-y=2z=-11
解三元一次方程x+y-z=-3,2x+y-3z=-2,3z-y=2z=-11

解三元一次方程x+y-z=-3,2x+y-3z=-2,3z-y=2z=-11
3z-y=2z=-11 这儿不对吧
x+y-z=-3①
2x+y-3z=-2②
3x-y+2z=-11 ③
①-②
x+y-z-2x-y+3z=-3+2
-x+2z=-1④
①+③
x+y-z+3x-y+2z=-3-11
4x+z=-14⑤
④*4+⑤
-4x+8z+4x+z=-4-14
9z=-18
z=-2
将z=-2代入⑤
4x-2=-14
4x=-12
x=-3
将x=-3代入①
-3+y+2=-3
y=-2