@[YellowBean](/user/104292) 是
by mrsrz @ 2020-02-18 12:57:57
我认为没有歧义
by mrsrz @ 2020-02-18 12:58:04
@[YellowBean](/user/104292) 啊不对，应该是 $=1$ 不是 $\leq 1$
by mrsrz @ 2020-02-18 12:58:37
@[mrsrz](/user/6813) 感谢 Merci
by YellowBean_Elsa @ 2020-02-18 17:04:48