Question

14. Aflați ultima cifră a numărului:
a) 32019 +52020 + 12021;
b) 2019+62020+20190
c) 42019+72020+82021-92022

Answer 1

Răspuns:

a)0

b)9

c)2

Explicație pas cu pas:

a) U(32019)+U(52020)+U(12021)= 9+0+1=10

U(sumei)=U(10)= 0

U(2019)+U(62020)+U(20190)= 9+0+0=9

U(sumei)=U(9)= 9

U(42019)+U(72020)+U(82021)+U(92022)= 9+0+1+2=12

U(sumei)=U(12)= 2