Question

Se considera numerele naturale a,b,c
daca a=5 si 2a+3b+3c=40,calculati a²+ab+ac

Answer 1

2a+3b+3c=2x5+3(b+c)=40=>3(b+c)=40-10=30=>b+c=30:3=10
a la patrat+ab+ac(dam fact comun a)=>a(a+b+c)=5(5+10)