Question

Afla numarul a daca ab+ac=520si b+c=52 b) afla a daca ab-ac=45 si b-c=9;afla suma b+c daca ab+ac+70=170 si a=25 d) afla diferenta b-c daca ab-ac-48=2 si a=10

Answer 1

520=ab+ac=a(b+c)=a*52, a=520:52=10

45=ab-ac=a(b-c)=a*9, a=45:9=5

ab+ac=170-70=100, 100=a(b+c)=25*(b+c), b+c=100:25=4

ab-ac=2+48=50, 50=a*(b-c)=10(b-c), b-c=50:10=5