Question

se considera numerele a si b . Comparati cele doua numere stiind ca a= -1+2-3+4-+.....-2019+2020 si b=2+4-6+8-...-2018+2020.Daca poate cineva.....​

Answer 1

Răspuns:

a=1010

b=-2018/4

Explicație pas cu pas:

a=-1+2-3+4-5+6-7+8-...-2019+2020

-1+2=1

-3+4=1

-5+6=1

-7+8=1

-2019+2020=1

=> a=1+1+1...+1 de 2020/2 ori

=> a=1010

b=2+4-6+8-10+12-14+...-2018+2020

2+4-6=0

8-10=-2

12-14=-2

-2018+2020=-2

=> b=-2-2-2...-2 de 2018/4

=> b=-2018/4