\(1\dfrac{1}{3}x1\dfrac{1}{4}x1\dfrac{1}{5}x...x1\dfrac{1}{2013}x1\dfrac{1}{2014}\)
\(\dfrac{4}{3}x\dfrac{5}{4}x\dfrac{6}{5}x...x\dfrac{2014}{2013}x\dfrac{2015}{2014}=\dfrac{1}{3}x2015=\dfrac{2015}{3}\)
trả lời giúp mik câu hỏi này nhé
A = ( 1 - 1/2 ) x ( 1 - 1/3 ) x ( 1 - 1/4 ) x...... x ( 1 - 1/2013 ) - ( 1 - 1/2014 )
A= (1-1/2)x(1-1/3)x(1-1/4)x.........x(1-1/2013)x(1-1/2014)
Tính A = ( 1- 1/2 ) x ( 1 - 1/3 ) x ( 1 - 1/4 ) x ... x ( 1 - 1/2013 ) x ( 1- 1/2014 )
A= (1-1/2)x(1-1/3)x(1-1/4)x.......x (1-1/2013)x(1-1/2014)=?
a)S = 1 + 1/3 + 1/9 + 1/27 + ..................... + 1/2187
b)S = 1 + 1/2 + 1/4 + 1/8 + ..................... + 1/128 + 1/256
c)A = 1 + 2 + 4 + 8 + ..................... + 4096 + 8192
d)1/1 x2 + 1/ 2 x 3 + 1/ 3 x 4 + ................. + 1/ 2013 x 2014
h)A = 1/1 x3 + 1/ 3 x 5 + 1/ 5 x 7 + ................. + 1/ 2013 x 2015
bai2a)1/ 2 x (1 + 2) + 1/ 2 x (1 + 2 + 3) + ............ + 1/2 x (1 + 2 + 3 + ....... + 9)
ai nhanh tick đúng nha
A=(1-1/2)x(1-1/3)x(1-1/4)x....x(1-1/2013)x(1-1/2014) .Vay A la
( 2013 x 2014 x 2014 x 2015 + 2015 x 2016 ) x 1+1/3 - 1 và 1/3 )
Bài 4: Tính nhanh
1/1 x2 + 1/ 2 x 3 + 1/ 3 x 4 + ................. + 1/ 2013 x 2014
tính nhanh:
1 1/13 x 1 1/14 x 1 1/15 x ........1 1/2013 x 1 1/2014
những số trên là hỗn số nhé
