Các câu hỏi tương tự
S = 1 + 1/3 + 1/9 + 1/27 + ..................... + 1/2187
Bài 2: Tính nhanh
S = 1 + 1/3 + 1/9 + 1/27 + ..................... + 1/2187
\(S=1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+.....+\frac{1}{2187}\)
\(S=1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+....+\frac{1}{2187}\)
Tính hợp lí
P=78×31+78×24+78×17+22×72
S=1+1/3+1/9+1/27+...+1/2187
1+1/3+1/9+1/27+....+1/2187
1/3 + 1/9 + 1/27 + 1/81 +...+1/729 + 1/2187
A) P=18x31+78x24+78x17+22x72
B) S=\(1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+...........\frac{1}{2187}\)
1/3 +1/9 + 1/27 + 1/81 + 1/243 + 1/729 + 1/2187 =?