Question

suma a doua numere este 931,diferenta lor este cat treimea nr mai mic.afla nr

Answer 1

Notam

x-nr

y-nr

---

x+y=931

x-y=y:3

x=931-y

931-y-y=y:3

931-2·y=y:3

931·3-2y·3=y

2793-6·y=y

y+6·y=2793

7·y=2793

y=2793:7

y=399

x=931-399

x=532

Answer 2

321+300+300=931

831+100=931

900+31=931