Question

m-am gindit la un nr.L-am inmultit cu4 am scazut produsul obtinut citul nr.32 si4,am impartit diferenta la 4,am adunat38,am impartit suma la3 si am obtinut17.La ce nr. m-am gindit?

Answer 1

{[4x-(32:4)]:4+38}:3=17

[(4x-8):4+38]:3=17

(x-2+38):3=17

x-2+38=51

x-2=13

x=15

verificare

{[(4*15)-(32:4)]:4+38}:3=17

[(60-8):4+38]:3=17

(52:4+38):3=17

(13+38):3=17

51:3=17

17=17

Answer 2

{[(a×4)-(32:4)]:4+38}:3=17

Prin metoda mersului invers :

17×3=51

51-38=13

13×4=52

32:4=8

52+8=60

4a=60

a=60:4

a=15