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Stiind ca b+c = 18 si a =7 , calculati axb+axc

Răspuns :

[tex]a(b+c)=ab+ac=7*18=126[/tex]
[tex]b+c=18 a=7 a*b+a*c=? a~este~factor~comun. a*b+a*c=a(b+c)=7*18=126 ...[/tex]