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Számítsd ki az ab + bc + ca öss​

Răspuns :

 

[tex]\displaystyle\bf\\ab + bc + ca=\\\\=10a+b+10b+c+10c+a=\\\\=10a+a+10b+b+10c+c=\\\\=11a+11b+11c=\\\\=\boxed{\bf11(a+b+c)}[/tex]