Question

3+3×[3+3×(3+3:3)]=(3a+3)×3+3​

Answer 1

Răspuns:

a=4

Explicație pas cu pas:

3+3×[3+3×(3+1)]=(3a+3)×3+3

3+3×(3+3×4)=(3a+3)×3+3

3+3×(3+12)=(3a+3)×3+3

3+3×15=(3a+3)×3+3

3+45=(3a+3)×3+3

48=(3a+3)×3+3

->de aici folosim metoda mersului invers:

48-3=(3a+3)×3

45:3=3a+3

15-3=3a

12:3=a

4=a