Question 1069165
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1.  First, I can not understand if it is ONE problem or 3.


2. Second, I can not understand what is written in the first line.
     You must use parentheses to make it clear.


3.  Third, the rule of this site admits ONE and ONLY ONE problem per post.



Please be <U>RESPONSIBLE</U>.


Please do not be <U>IRRESPONSIBLE</U>.


Thank you.