Question

afla nr a ,dacă ab+ac=520 si b+c =52

Answer 1

ab+ac=520
a(b+c)=520
dar stim ca b+c =52
a x 52 = 520
a=520:52
a=10

Answer 2

ab+ac=520 --> a x (b+c)=520 --> a x 52=520 --> a= 520:52 --> a= 10