2x+3y+2z=10 3x+4y+z=11 4x+5y+z=12
人气：422 ℃ 时间：2020-05-24 13:04:25
解答
第三个式子可得：z=12-4x-5y,
带入第一,二式可得：
6x+7y=14,x=1-y
所以,y=8,x=-7,z=0
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