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Se stie ca : ab+ac+a=165 si b+c=10 . Aflati a

Răspuns :

a(b+c+1)=165
a(10+1)=165
11a=165
a=165:11
a=15
a(b+c+1)=165
a(10+1)=165
11a=165, a=165:11=15