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2式-1式得: X+Y=-9Z……3式 1式x2-2式得 X+2Y=13Z……4式 4式-3式得:Y=22Z 代入3式得:X=-31Z 於是有:X+Y+Z/X-Y+Z= -31Z+22Z+Z/-31Z-22Z+Z =8/-52=2/-13
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