15题please

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15题please
x=N@bY ޿]p=:6$ B;DAtHHTbfOS?۰6\9Uxr8Mi8M&Y݄ݴ1+mn2lnmm= ?ӔWS@ʠd*E0o`q(A*K5@'F,+]r`Q{TIF:Y.<RE¬须ھd1|{|v`W_\f

15题please
15题please
 

15题please
m的值是0 -2 2 4共四个