Các câu hỏi tương tự
C=\(\frac{1}{1.2.3}\)+ \(\frac{1}{2.3.4}\) + \(\frac{1}{3.4.5}\) +...........+ \(\frac{1}{99.100.101}\)
Giúp mình với!!!!!!
\(E=\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+..............+\frac{1}{99.100.101}\)
\(F=1.3.3^2+3^3+..............+3^{200}\)
\(M=\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...............+\frac{1}{2^{100}}\)
\(E=\frac{1}{1.2}-\frac{1}{1.2.3}+\frac{1}{2.3}-\frac{1}{2.3.4}+\frac{1}{3.4}-\frac{1}{3.4.5}+....+\frac{1}{99.100}-\frac{1}{99.100.101}\)
\(F=\frac{1}{1.2.3.4}+\frac{1}{2.3.4.5}+\frac{1}{3.4.5.6}+...+\frac{1}{47.48.49.50}\)
Tính
\(C=1+\frac{1}{\left(-3\right)}+\frac{1}{\left(-3\right)^2}+....+\frac{1}{\left(-3\right)^{2015}}\)
Tính\(A=2.\left(\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+...+\frac{1}{98.99.100}\right)\)
Tính nhanh:
\(A=\frac{1}{1.2.3}-\frac{1}{2.3.4}-\frac{1}{3.4.5}-...-\frac{1}{97.98.99}\)
\(\frac{1}{1.2.3}.\frac{1}{2.3.4}.\frac{1}{3.4.5}...\frac{1}{98.99.100}\)
\(A=\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+...+\frac{1}{37.38.39}\)
giúp mình với
Tính:\(\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+...+\frac{1}{2018.2019.2020}.\)
1.CMR:\(A=\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+...+\frac{1}{18.19.20}