Tinh nhanh:
\(1\frac{1}{3}\times1\frac{1}{8}\times1\frac{1}{15}\times...\times1\frac{1}{9800}\)

\(1\frac{1}{3}\cdot1\frac{1}{8}\cdot1\frac{1}{15}\cdot..........\cdot1\frac{1}{9800}\)tinh nhanh

tính

1 /1/2 x 1 1/3 x 1/4 ....1 1/2017

[ 1 - 1/5 ] x [ 1 - 1/6 ] x [ 1 - 1/7 ] x [ 1 -1/8 ] x [ 1 - 1/9 ]

1 1/3 x 1 1/8 x 1 1/15 ....1 1/9800

2/Tính nhanh

1(1/13)x1(1/8)x...x1(1/9800)

A=1/3+1/9+1/27+1/81+....+1/6561

B=2/8+1/24+2/48+....+2/9800

Tính nhanh: C = (1+1/3).(1+1/8).(1+1/15)...(1+1/9800)

(1 + 1/3) x (1 + 1/8) x (1 +15) x.......x (1 + 1/9800)

(-1+1/3)(-1+1/8)(-1+1/15)....(-1+1/9800) . Mong các bạn làm giúp mk!

tính nhanh:   \(1\frac{1}{4}\times1\frac{1}{8}\times1\frac{1}{15}\times1\frac{1}{24}\times1\frac{1}{35}\times...\times1\frac{1}{9800}\)