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an=5+(11)5 5+55
an=60
2) an=9+(48-1)3 9+(47)3
9+141 an =150
3) an=3+(63-1)7 3+(62)7
3+434 an=437
4) an= 11+(12-1)(-5) 11+(11)(-5)
11-55 an=-44