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| 分享使你變得更實在,可以使其他人感到快樂,分享是我們的動力。今天就來分享你的資訊、圖片或檔案吧。 The description is clear. It meant to say that, if we take the number wrongly (in sign), and if we know that only one number is wrong, then we can figure it out by making half of the difference to match that number (but different sign).
For example, if we add 4 numbers together: 1+2+3+4 = 10. But, now, we make a mistake and only get 6. The difference is 4, and half of that is 2. So, we must have made the mistake in the sign of "2", i.e. 1 - 2 + 3 + 4 = 6. ... |
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