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ab+ac+a=165 b+c=10 aflati a

Răspuns :

ab+ac+a=165
b+c=10
ab+ac+a=165
a(b+c) +a=165
a 10+a=165=> 11a=165 deci a =15
Nero14
ab+ac+a=165
b+c=10
a(b+c+1)=165
a(10+1)=165
a•11=165
a=165:11
a=15

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