\(A=\left(1-\frac{1}{2}\right)\left(1-\frac{1}{3}\right)\cdot...\cdot\left(1-\frac{1}{2015}\right)=\frac{1}{2}\cdot\frac{2}{3}\cdot...\cdot\frac{2014}{2015}=\frac{1\cdot2\cdot3\cdot...\cdot2014}{2\cdot3\cdot...\cdot2014\cdot2015}=\frac{1}{2015}\)
a = (1 -1/2) x (1-1/3) x (1-1/4) x...x(1-1/2014) x(1-1/2015) = ?
a = (1 -1/2) x (1-1/3) x (1-1/4) x...x(1-1/2014) x(1-1/2015) = ?
cơ hội hiếm
Tính nhanh A = ( 1 - 1/2 ) x ( 1 - 1/3 ) x ( 1 - 1/4 ) x...... x ( 1 - 1/2014 ) - ( 1 - 1/2015 )
vẽ cho mk bài nay nha hkadjkslf
a = (1 -1/2) x (1-1/3) x (1-1/4) x...x(1-1/2014) x(1-1/2015) = ?
(1-1/2) x (1-1/3) x (1 -1/4) x.....x (1-1/2014) x ((1-1/2015) x (1-1/2016)
nếu 1-1/2 x 1-1/3 x .....x 1- 1/2014 x1 -1/2015 x a =1 thì a
tính nhanh ;
a) (1-1/2)x(1-1/3)x(1-1/4)x....x(1-1/2014)x(1-1/2015)
b) 1/2+1/4+1/8+....+1/256
c) 5/2+5/4+5/8+....+5/256
( 2013 x 2014 x 2014 x 2015 + 2015 x 2016 ) x 1+1/3 - 1 và 1/3 )
tính nhanh
a) (1-1/2)x(1-1/3)x(1-1/4)x...x(1-1/2014)x(1-1/2015).
b) 1/2 +1/4+1/8+...+1/256.
c)5/2+5/4+5/8+...+5/256
d)14,35+(13,7-13,6)x1
