解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
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解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1x
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
x-2y+z=-1①
x+y+z=2②
x+2y+3z=-1③
①+③
2x+4z=-2
x+2z=-1④
①+②×2
3x+3z=-1+4
x+z=1⑤
由⑤得x=1-z代入④
1-z+2z=-1
z=-2
∴x=1-(-2)=3
代x=3;z=-2入②
3+y-2=2
y=1
即:方程组的解为x=3;y=1;z=-2
x=3
y=1
z=-2
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