@[WydnksqhbD_3](/user/753481) 才看到是小号……
by _TCR_ @ 2024-05-06 19:59:42
@[lunjiahao](/user/779970) $x=0$ 时有 $x^n=0$?
by WydnksqhbD_3 @ 2024-05-06 20:01:05
@[WydnksqhbD_3](/user/753481)
好像没有定义?(不是很懂)
$$x^n=0 \implies n=\log_x 0$$
但是 $n=\log_x y\ (x \not = 1 ,x>0)$
(我不确定有没有推错owo)
by lunjiahao @ 2024-05-06 20:10:41
@[WydnksqhbD_3](/user/753481)
$n>0$,不记得能不能取等
by lunjiahao @ 2024-05-06 20:12:30
@[lunjiahao](/user/779970) 定义出问题了?对数 $\log_aN$ 似乎不允许 $N\le0$
by WydnksqhbD_3 @ 2024-05-06 20:13:06
@[WydnksqhbD_3](/user/753481)
是吧?
by lunjiahao @ 2024-05-06 20:15:20
@[lunjiahao](/user/779970) 高中课本是这么写的好像(说不定是 $a>0$)
by WydnksqhbD_3 @ 2024-05-06 20:16:39
@[WydnksqhbD_3](/user/753481)
?我表达的不是 $a>0$ 且 $a \not = 1$ 吗()
by lunjiahao @ 2024-05-06 20:18:18
@[_TCR_](/user/483466) 明白了你是 @[WydnksqhbD_3](/user/753481) 的npy
by Special_Tony @ 2024-05-06 20:19:57
@[nothing_exe_studio](/user/1108078) c++里会RE
by Special_Tony @ 2024-05-06 20:20:20