Răspuns:
Explicație pas cu pas:
1+1/2=2/2+1/2=3/2
1+1/3=3/3+1/3=4/3
1+1/4=4/4+1/4=5/4
-----------------------------
1+1/2020=2020/2020+1/2020=2021/2020
ex devine
3/2*4/3*5/4*.......*2020/2019*2021/2020
se simplifica 3, 4, 5.......2020
ramane = 2021/2=1010,5