F= \(\frac{1}{1.2.3}\)- \(\frac{1}{2.3.4}\)+ \(\frac{1}{2.3.4}\)- \(\frac{1}{3.4.5}\)+....+\(\frac{1}{47.48.49}\)- \(\frac{1}{48.49.50}\)
F=\(\frac{1}{1.2.3}\)- \(\frac{1}{48.49.50}\)
F=\(\frac{6533}{39200}\)
\(\frac{1}{1.2.3.4}+\frac{1}{2.3.4.5}+\frac{1}{3.4.5.6}+......+\frac{1}{47.48.49.50}\)
bằng mấy nhỉ
\(E=\frac{1}{1.2}-\frac{1}{1.2.3}+\frac{1}{2.3}-\frac{1}{2.3.4}+\frac{1}{3.4}-\frac{1}{3.4.5}+....+\frac{1}{99.100}-\frac{1}{99.100.101}\)
\(F=\frac{1}{1.2.3.4}+\frac{1}{2.3.4.5}+\frac{1}{3.4.5.6}+...+\frac{1}{47.48.49.50}\)
Tính
\(C=1+\frac{1}{\left(-3\right)}+\frac{1}{\left(-3\right)^2}+....+\frac{1}{\left(-3\right)^{2015}}\)
Tính F = 1/1.2.3.4 +1/2.3.4.5+1/3.4.5.6+....+1/47.48.49.50
Tính
\(\frac{1}{1.2.3.4}+\frac{1}{2.3.4.5}+...+\frac{1}{47.48.49.50}\)
tính:
\(\frac{1}{1.2.3.4}+\frac{1}{2.3.4.5}+\frac{1}{3.4.5.6}+...+\frac{1}{97.98.99.100}\)
Giải giúp mình bài này nhé
\(\frac{1}{1.2.3.4}+\frac{1}{2.3.4.5}+\frac{1}{3.4.5.6}+...+\frac{1}{116.117.118.119}\)
Tính
a) K =\(\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+...+\frac{1}{2015.2016.2017}\)
b) O = \(\frac{1}{1.2.3.4}+\frac{1}{2.3.4.5}+\frac{1}{3.4.5.6}+...+\frac{1}{2015.2016.2017.2018}\)
tính nhanh
A= \(\frac{1}{1.2.3.4}\)+\(\frac{1}{2.3.4.5}\)+\(\frac{1}{3.4.5.6}\)+.........+\(\frac{1}{27.28.29.30}\)
Tìm x biết (:\(\frac{1}{1.2.3.4}+\frac{1}{2.3.4.5}+\)\(\frac{1}{3.4.5.6}+...+\frac{1}{7.8.9.10}\)) .x = \(\frac{119}{720}\)
( Ai giải mình mới tick nha )
