若a的相反數是-a,則-a小於0為什麼錯?
回答 (1)
2017-10-17 5:59 pm
It is not stated that a is larger than 0.
eg. a = -3
-a = 3
Therefore, it is wrong.
eg. a = -3
-a = 3
Therefore, it is wrong.
收錄日期: 2021-04-18 17:53:54
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