解方程组 {3x+2y+z=2 x+3y+2z=1 2x+y+3z=9
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解方程组 {3x+2y+z=2 x+3y+2z=1 2x+y+3z=9
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![解方程组 {3x+2y+z=2 x+3y+2z=1 2x+y+3z=9](/uploads/image/z/1708345-1-5.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%84+%7B3x%2B2y%2Bz%3D2+x%2B3y%2B2z%3D1+2x%2By%2B3z%3D9)
解方程组
{3x+2y+z=2 (1)
x+3y+2z=1 (2)
2x+y+3z=9 (3)
解,得:
由(1)*2-(2)得:
5x+y==3 (4)
由(2)*3-(3)*2得:
x-7y==15 (5)
由(4)*7+(5)得:
36x==36
x==1
y==-2
z==3
{3x+2y+z=2 (1)
x+3y+2z=1 (2)
2x+y+3z=9 (3)
解,得:
由(1)*2-(2)得:
5x+y==3 (4)
由(2)*3-(3)*2得:
x-7y==15 (5)
由(4)*7+(5)得:
36x==36
x==1
y==-2
z==3
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