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Robert260
a fost răspuns

Scoate factor comun a : ab +ac ; ab+7a ; ab+a ;ab-ac ; ab-3a ; ab-a ; ab +ac + ad ; ab+5a - ac; ab+ac -a .

Răspuns :

CosmoteRo
ab+ac=a (b+c)
ab+7a=a (b+7)
ab+a=a(b+1)
(ab-ac)=a(b-c)
ab-3a=a(b-3)
ab-a=a(b-1)
ab+ac+ad=a(b+c+d)
ab+5a-ac=a(b+5-c
ab+ac-a=a(b+c-1))

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