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樓主是沒搞懂倒數和相反數的概念吧.記住,倒數是只在分數和整數之間的相互轉換,負二分之一的倒數是-2.相反數是正數和負數之間的“關係”(你懂得),就是正負的轉換.兩者是分開的,不相關的.(純手打,超累,望採納)
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