急!用加减消元法做!要有详细过程! x+3y+z=-1,2x-y+3z=7,3x+y+2z=3
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![急!用加减消元法做!要有详细过程! x+3y+z=-1,2x-y+3z=7,3x+y+2z=3](/uploads/image/z/9864861-69-1.jpg?t=%E6%80%A5%21%E7%94%A8%E5%8A%A0%E5%87%8F%E6%B6%88%E5%85%83%E6%B3%95%E5%81%9A%21%E8%A6%81%E6%9C%89%E8%AF%A6%E7%BB%86%E8%BF%87%E7%A8%8B%21+x%2B3y%2Bz%3D-1%2C2x-y%2B3z%3D7%2C3x%2By%2B2z%3D3)
急!用加减消元法做!要有详细过程! x+3y+z=-1,2x-y+3z=7,3x+y+2z=3
急!用加减消元法做!要有详细过程! x+3y+z=-1,2x-y+3z=7,3x+y+2z=3
急!用加减消元法做!要有详细过程! x+3y+z=-1,2x-y+3z=7,3x+y+2z=3
x+3y+z=-1,--------->2x+6y+2z=-2 ①-
2x-y+3z=7----,②-------->6x-3y+9z=21----(4)
3x+y+2z=3----,③ -------> 6x+2y+4z=6 ----(5)
,② -①:-7y+z=9-------- -35y+5z=45---------(6)
(4)-(5) -5y+5z=15 ------35y+35z=105------(7)
(7)-(6) 30z=60 ,z=2 ,y=-1 ,x=0