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解是整數,囙此X有±1、±2、±4三種可能 當X=1,K-1=4,K=5 當X=-1,K-1=-4,K=-3 當X=2,K-1=2,K=3 當X=-2,K-1=-2,K=-1 當X=4,K-1=1,K=2 當X=-4,K-1=-1,K=0
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