=[1+1/2]x[1+1/3]x......x[1+1/2005]
=3/2x4/3x........x2006/2005
=2006/2=1003
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Tính
1/1*2 + 1/2*3 + 1/3*4 + ... + 1/2004*2005 + 1/2005*2006
xếp theo thứ tự tăng dần: 3/2 ; 1/10 ; 10/9 ; 1/4 ; 1/5 ; 4/5 ; 3/4 ; 3/50 ; 3/52 ; 2/3 ; 2006/2005 ; 1/12 ; 1/2 ; 3/58 ; 2010/2009 ; 1/21 ; 3/55 ; 1/6 ; 1/5 ; 1/3
Tính nhanh : a [ 1 + 1 /2 ] x [ 1 + 1 / 3 ] x [ 1 + 1 / 4 ] x .... x [ 1 + 1 / 2005 ]
Bài 1 : Sắp xếp
5/4, 1/4, 1/23/50, 1/5, 4/5, 2006/2005, 2016/2017, 1/20, 3/55, 2017/2016, 3/58, 3/31, 1/12, 1/6, 3/5, 2/3, 3/52, 3/4, 1/15
( 2006 x 2005 + 2005 + 2004 ) x (1 + \(\frac{1}{2}:\frac{3}{2}-\frac{3}{4}\)) = ?
(1+1/2)x(1+1/3)x...(1+1/2005)
B=1/3+1/3^2+1/3^3+...+1/3^2004+1/3^2005 CMR B<1/2
(1+1/2)x (1+1/3)x....x(1+1/2005)
(1+1/2) x (1+1/3) x ..... x ( 1 x 1/2005)