so sánh: \(1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+........-\frac{1}{2008}\)với \(\frac{1}{1005}+\frac{1}{1006}+.....+\frac{1}{2008}\)
CMR: 1/1005+1/1006+1/1007+...+1/2009+ 1-1/2+1/3-1/4+...+1/2008+1/2009
Tính \(\frac{A}{B}\) biết :
A = \(1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{2007}-\frac{1}{2008}\)
B = \(\frac{1}{1005}+\frac{1}{1006}+\frac{1}{1007}+...+\frac{1}{2007}+\frac{1}{2008}\)
Giúp mình nhé
Bài 1 Tính\(\frac{A}{B}\)biết
a)A=\(\frac{1}{1.300}+\frac{1}{2.301}+\frac{1}{3.302}+...+\frac{1}{101.400}\)
B=\(\frac{1}{1.102}+\frac{1}{2.103}+\frac{1}{3.104}+...+\frac{1}{299.400}\)
b)A=1/2+1/3+1/4+...+1/200
B=1/199+2/198+3/197+...+199/1
c)A=1-1/2+1/3-1/4+...+1/2007-1/2008
B=1/1005+1/1006+1/1007+...+1/2007+1/2008
so sánh 2005^2017+1/2005^2008+2 và 2005^2018+4?2005^2019+3
So Sánh:
1/1*2+1/2*3+1/3*4+..............+1/2007*2008 với 1
so sánh \(\frac{1003+1}{1004}\) và \(\frac{1005+1}{1006}\)
CMR: 1/1005+1/2006+...+1/2009=1-1/2+1/3-1/4+...-1/2008+1/2009
so sánh:
1/1^2+1/3^2+1/4^2+.....+1/2018^2 với 1