動動腦-邏輯推理

很久沒動腦了嗎?
自從出社會就沒在認真算過數學、解題了嗎?
一起來動動快生鏽的大腦吧。
集收一些數學、邏輯、推理的題目，並附詳解，
一起把紙筆拿出來~
可離線。 Long time no brains it?
Since the community is no serious counted in mathematics, problem solving it?
Dodo together fast rusty brain bar.
Set to close some math, logic, reasoning subject, along with detailed,
Together with the pen and paper out ~
Offline.