Các câu hỏi tương tự
-1/2016.2015-1/2015.2014-1/2013.2012-...-1/3.2-1/2.1
Tính nhanh:
a)\(A=\frac{1}{2015}-\frac{1}{2015.2014}-\frac{1}{2014.2013}-...-\)\(\frac{1}{3.2}-\frac{1}{2.1}\)
b)\(B=54-\frac{1}{2}.\left(1+2\right)-\frac{1}{3}.\left(1+2+3\right)\)\(-...-\frac{1}{12}.\left(1+2+3+..+12\right)\)
Giải Hộ Mình Pls
Tính:
\(a.\frac{1}{99}-\frac{1}{99.98}-...-\frac{1}{3.2}-\frac{1}{2.1}\)
\(b.\frac{2}{100.99}-\frac{2}{99.98}-...-\frac{2}{3.2}-\frac{2}{2.1}\)
\(\frac{1}{99}-\frac{1}{99.98}-\frac{1}{98.97}-\frac{1}{97.96}-...-\frac{1}{3.2}-\frac{1}{2.1}\)
\(S=\frac{1}{2006.2005}+\frac{1}{2005.2004}+\frac{1}{2004.2003}-...-\frac{1}{3.2}-\frac{1}{2.1}\)
Tính: A=\(\frac{1}{2003.2002}-\frac{1}{2002.2001}-\frac{1}{2001.2000}-...-\frac{1}{3.2}-\frac{1}{2.1}\)
Tính nhanh:\(\frac{1}{100}-\frac{1}{100.99}-\frac{1}{99.98}-...-\frac{1}{3.2}-\frac{1}{2.1}\)
tính nhanh : \(C=\frac{1}{100}-\frac{1}{100.99}\frac{1}{99.98}-\frac{1}{98.97}-...........-\frac{1}{3.2}-\frac{1}{2.1}\)
A=\(\frac{1}{199}-\frac{1}{199\cdot198}-\frac{1}{198-197}-\frac{1}{197-196}-...-\frac{1}{3.2}-\frac{1}{2.1}\)