Răspuns :
a*b +a*c=a(b+c)=715
18a(5b+5c)= 18 *5 *a (b+c)= 90*a(b+c)= 90*715= 64 350
18a(5b+5c)= 18 *5 *a (b+c)= 90*a(b+c)= 90*715= 64 350
ab+ac=715
dam factor comun pe a ,astfel :
[tex]a(b+c)=715[/tex]
dam factor comun si in cazul 18a(5b+5c) ,in interiorul parantezelor pe 5
astfel vine :
[tex]18X5a(b+c)=90a(b+c)[/tex]
[tex]90a(b+c)=90X715= 64 350[/tex]
dam factor comun pe a ,astfel :
[tex]a(b+c)=715[/tex]
dam factor comun si in cazul 18a(5b+5c) ,in interiorul parantezelor pe 5
astfel vine :
[tex]18X5a(b+c)=90a(b+c)[/tex]
[tex]90a(b+c)=90X715= 64 350[/tex]