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設IxI在2和9之間 即2≤IxI≤9 1.IxI≥2解得x≤-2或x≥2 2.IxI≤9解得-9≤x≤9 綜上:-9≤x≤-2或2≤x≤9 所以所有整數有-9,-8,-7,-6,-5,-4,-3,-2和2,3,4,5,6,7,8,9 顯然它們的和=0
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