It's a simple(简单的)sum(算术题).Can you work out which ( 哪一个)numb
It's a simple(简单的)sum(算术题).Can you work out which ( 哪一个)number is represented(代表)by the letter O and which is represented by the
K
K
+ K
_________________
O K
O=?K=?
K
K
+ K
_________________
O K
O=?K=?
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