Question

Cho P=5⁰+5¹+5²+...+5²⁰¹⁷ và Q=5²⁰¹⁸ : 4.Tính Q - P

Answer 1

5P=5+5^1+5^2+...+5^2017+5^2018

5P-1P=(5+5^2+....+5^2017+5^2018)-(5^0+5*1+...+5^2017)

4P=5^2018-1

P=(5^2018-1):4

=> Q-P=1/4 

Answer 2

mot o to cu di tieu thi tieu thu het 12,5l xang Hoi o to do di quang dai 60km thi tieu thu het bao nhieu l xang