Question

Suma a doua nr  consecutive pare este 842
afla nr ?
metoda algebrica

Answer 1

2k+2k+2=842
4k+2=842
4k=840
k=840/4
k=210=>2k=420 si 2k+2=422 , deci numerele sunt 420 si 422

Answer 2

a+b=842
a,b= nr. consec. pare
b=a+2
a+a+2=842
2a+2=842
2a=842-2
2a=840
a=840 :2
a=420
b=420 + 2
b=422