Các câu hỏi tương tự
a, 1/3.4+1/4.5+..........+1/20.21
b, 1/4.6 + 1/6.8 +.............+ 1/30.32
20 tháng 3 2015 lúc 21:07
tính: 1/2.4 + 1/4.6 + 1/6.8 +...+1/30.32 =?
Tính nhanh:
a, 1/3.4+1/4.5+..........+1/20.21
b, 1/4.6 + 1/6.8 +.............+ 1/30.32
Bài 15 tính tổng a) A= 1/1.2 +1/2.3 +1/3.4 +...+1/2011.2012 b) B= 1/2.4 +1/4.6 + 1/6.8+.,.......+1/2010.2012
tính
a, 1/1.2+1/2.3+1/3.4+....+1/999.1000
b, B= 1/2.4+1/4.6+1/6.8+1/8.10
A=1/2.3+1/3.4+...+1/99.100
B+5/1.4+5/4.7+...+5/100.103
C=4/2.4+4/4.6+4/6.8+....+4/2008.2010
A= 1/1.2+1/2.3+1/3.4+...+1/49.50
A=2/1.3+2/3.5+2/5.7+....+2/49.51
A=1/2.4+1/4.6+1/6.8+....+1/18+20
Giúp e ạ,nhanh e tik ( ◜‿◝ )♡( ◜‿◝ )♡
\(A=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{2015.2016}\)
\(B=\frac{1}{2.4}+\frac{1}{4.6}+\frac{1}{6.8}+...+\frac{1}{2014.2016}\)
Mấy bạn giúp mik nha
A=1/2.74+1/4.6+1/6.8+...+1/2018.2020