2x+y+z=11
x+2y+z=16
x+y+2z=17
左边加左边,右边相加
得出3x+3y+3z=44
除3 x+y+z=44/3
再依次用上面的式子减去下面得出的式子
得出x=-11/3
y=4/3
z=7/3
2x+y+z=11,x+2y+z=16,x+y+2z=17
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