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這個題目其實比較簡單: 因為我們知道每一項是相差兩倍且符號相反,所以要想三個數之和為負的話,只能中間數為正,設首位數為-x,則有-x+2x-4x=-3x=-96,則x=32; 所以這三個數分別為-32,64,-128. 希望解答了你的疑問.
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