Bài 1: tính nhanh
A): B= 2 + 4 + 6 +…+ 1000
B):C= 1 + 3 + 5 +…+1001
C): 1/3 + 1/9 + 1/27 + 1/81 + 1/ 283 + 1/729
D): 3/2 + 3/8 + 3/32 + 3/128+3/512
E): 3 + 3/5 + 3/25 + 3/125 + 3/625
G): 1/5 + 1/10 + 1/20 + 1/40 +………+1/1280
H):1/3+1/9+1/27+1/81+……+1/59049
Loga
Sinh Học lớp 12
