\(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+.......+\frac{1}{2014}-\frac{1}{2016}\)\(=1-\frac{1}{2016}=\frac{2015}{2016}\)
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\(\frac{4}{2.4}+\frac{4}{4.6}+\frac{4}{6.8}+...+\frac{4}{2012.2014}+\frac{4}{2014.2016}\)
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giúp minh nha!!
\(\frac{4}{2.4}\)\(+\frac{4}{4.6}\)\(+\frac{4}{6.8}\)\(+...+\frac{4}{2012.2014}\)\(+\frac{4}{2014.2016}\)
\(F=\frac{4}{2.4}+\frac{4}{4.6}+\frac{4}{6.8}+...+\frac{4}{2014.2016}\)
a \(\frac{4}{2.4}+\frac{4}{4.6}+\frac{4}{6.8}+...+\frac{4}{2012.2014}+\frac{4}{2014.2016}\)
b\(\frac{10}{99}+\)\(\frac{11}{199}-\)\(\frac{12}{299}.\)\(\frac{1}{2}-\)\(\frac{1}{3}+\)\(\frac{-1}{6}\)
\(\frac{4}{2.4}+\frac{4}{4.6}+\frac{4}{6.8}+.....+\frac{4}{2008.2010}\)
C=\(\frac{4}{2.4}+\frac{4}{4.6}+\frac{4}{6.8}+....+\frac{4}{2008.2010}\)
Tính nhanh \(K=\frac{4}{2.4}+\frac{4}{4.6}+\frac{4}{6.8}+...+\frac{4}{2008.2010}\)
\(A=\frac{4}{2.4}+\frac{4}{4.6}+\frac{4}{6.8}+...+\frac{4}{2008.2010}\)
\(B=\frac{1}{18}+\frac{1}{54}+\frac{1}{108}+...+\frac{1}{990}\)
Tính :
\(\frac{4}{2.4}\)+ \(\frac{4}{4.6}\)+ \(\frac{4}{6.8}\)+ .... +\(\frac{4}{2008.2010}\)