c. C = 1 – 2 + 3 – 4 + 5 – 6 + … + 1999 – 2000
d. D = 1 + 2 – 3 – 4 + 5 + 6 – 7 – 8 + … + 97 + 98 – 99 – 100
e. M = (2020 – 11).(2019 – 12).(2018 – 13)…(11 – 2020)
Loga
Sinh Học lớp 12
