若a的相反數是-a,則-a小於0為什麼錯?

👨🏻‍🏫 學術台數學

[匿名]

2017-10-17 12:53 am

回答 (1)

Kill you

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.

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