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這個直接代入算就可以了.4≤X-8(Y-1)<8簡化得:4≤X-8y+8<8兩邊减去8得出: -4≤X-8y<0然後代入(X-4Y=78)得出:-4≤78-4y<0整理得出:20.5≥y>19.5而y是整數,所以就只能是20了,那x=158了.
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