Đáp án:
Giải thích các bước giải:
A= 2020^0+2020^1+2020^2+......+2020^2020
2A= 2.(2020^0+2020^1+2020^2+.....+2020^2020)
2A= 2020^1+2020^2+2020^3+.......+2020^2020
2A-A=(2020^1+2020^2+2020^3+.....+2020^2020)- (2020^0+2020^1+2020^2+........+2020^2020)
A= 2020^2020-1
mà B=2020^2020-1
=> A=B