Răspunsuri

2014-08-02T15:07:31+03:00
A*b +a*c=a(b+c)=715

18a(5b+5c)= 18 *5 *a (b+c)= 90*a(b+c)=   90*715=  64 350
2 3 2
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2014-08-02T15:38:32+03:00
Ab+ac=715
dam factor comun pe a ,astfel :

a(b+c)=715

dam factor comun si in cazul 18a(5b+5c) ,in interiorul parantezelor pe 5
astfel vine :

18X5a(b+c)=90a(b+c)

90a(b+c)=90X715=  64 350
1 5 1