3+3/2+3/22+...+3/29
=3+3/2+3/4+...+3/512
=3(1+1/2+1/4+...+1/512)
=3(2-1+1-1/2+1/2-1/4+...+1/256-1/512)
=3(2-1/512)
=3.1/511/512=5/509/512
Đúng 0
Bình luận (0)
3+3/2+3/22+...+3/29
=3+3/2+3/4+...+3/512
=3(1+1/2+1/4+...+1/512)
=3(2-1+1-1/2+1/2-1/4+...+1/256-1/512)
=3(2-1/512)
=3.1/511/512=5/509/512
Tính tổng ; S=3+ 3/2+3/2^2+...+3/2^9
Tính tổng S=3+3/2+3/2^2+...+3/2^9
tính tổng:
S=3+3/2+3/2^2+3/2^3+.....+3/2^9
Tính tổng S=3+3/2+3/2^2+3/2^3+...3/2^9
Tính tổng :
S = 3 + 3/2 + 3/2^2 + ... + 3/2^9
Tính tổng S=3+3/2+3/22+...+3/29
Tính tổng S=3+3\2+3\22+...+3\29
Tính tổng: S=3+3/2+3/22+...+3/29
tính tổng: S=3+3/2+3/22+....+3/29