\(\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}+\frac{1}{243}\)
\(=\frac{3}{9}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}+\frac{1}{243}\)
\(=\frac{4}{9}+\frac{1}{27}+\frac{1}{81}+\frac{1}{243}\)
\(=\frac{12}{27}+\frac{1}{27}+\frac{1}{81}+\frac{1}{243}=\frac{13}{27}+\frac{1}{81}+\frac{1}{243}=\frac{39}{81}+\frac{1}{81}+\frac{1}{243}=\frac{40}{81}+\frac{1}{243}\)
\(=\frac{120}{243}+\frac{1}{243}=\frac{121}{243}\)
Tính nhanh : 1/3 + 1/9 + 1/27 + 1/81 + 1/243 + 1/729
Tính nhanh:
1 + 1/3 + 1/9 + 1/27 + 1/81 + 1/243 + 1/729
1+1/3+1/9+1/27+1/81+1/243
tính nhanh
1 + 1/3 + 1/9 + 1/27 ++ 1/81 + 1/243
KHỬ LIÊN TIẾP ( TÍNH NHANH )
Tính nhanh:
1+ 1/3 + 1/9 + 1/27 + 1/81 + 1/243 + 1/729
tính nhanh
a) 1/2+1/4+1/8+1/16+1/32
b) 1/3+1/9+1/27+1/81+1/243+1/729
tính nhanh
1/3+1/9+1/27+1/81=1/243=1/729
tính nhanh 1+3+9+27+81+243+729+2187+6561+19683+59049
Tính nhanh:
\(\frac{1}{3}+\frac{1}{9}+\frac{1}{27}+\frac{1}{81}+\frac{1}{243}+\frac{1}{729}\)
