想好了嗎？
_

 

_

 

_

-

 

 

_

_

_
答案：答案是18.

11 × 11 = 121 → 1 + 2 + 1 = 4
22 × 22 = 484 → 4 + 8 + 4 = 16

因此推論出，

33 × 33 = 1089 → 1 + 0 + 8 + 9 = 18

敏感肌遇到冬天好惱人？屬於妳的卸妝油來了
➡ https://www.tagsis.com/article/11152