[問題]GWD13-26

[blacklilu]

If = 5, what is the value of n?
(1) n2 is not equal to 0.
(2) n2 + 10n = 0

Ans : A

請教為何 2) 沒辦法成立？

[homaru]

If |n+5|=5,what is the value of n?
(1) n[sup]2[/sup] is not equal to 0.
(2) n[sup]2[/sup] + 10n = 0

|n+5|=5, so n=0 or n=-10

由(1), n=0
由(2), n=0 or -10皆可成立(故不確定)

[blacklilu]

阿呀 謝謝呀，我忘了-10 囉...果然又唸到變成智障了