2x+y+z=17① x+2y+z=18② x+y+2z=21③ ② +③ 2x+3y+3z=39 减①得 2y+2z=22 代入① x=3, 代入③得 y+2z=18 y+z=11 z=7,y=4
解下列方程与:2x+y+z=17x+2y+z=18x+y+2z=21
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{4x-9z=17{3x+y+15z=18{x+2y+3z=2
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4x-9z=17 3x+y+15z=18 x+2y+3z=2
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4x-9z=17 3x+y+15z=18 x+2y+3z=2
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{4x-9z=17 3x+y+15z=18 x+2y+3z=2
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4X-9Z=17 3X+Y+15Z=18 X+2Y+3Z=2