Các câu hỏi tương tự
\(E=\frac{1}{1.2}-\frac{1}{1.2.3}+\frac{1}{2.3}-\frac{1}{2.3.4}+\frac{1}{3.4}-\frac{1}{3.4.5}+....+\frac{1}{99.100}-\frac{1}{99.100.101}\)
\(F=\frac{1}{1.2.3.4}+\frac{1}{2.3.4.5}+\frac{1}{3.4.5.6}+...+\frac{1}{47.48.49.50}\)
Tính
\(C=1+\frac{1}{\left(-3\right)}+\frac{1}{\left(-3\right)^2}+....+\frac{1}{\left(-3\right)^{2015}}\)
\(A=\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+...+\frac{1}{99.100.101}\)=?
\(\frac{1}{2.3.4}+\frac{1}{3.4.5}+.....+\frac{1}{97.98.99}\)
\(\frac{3}{2^1}+\frac{3}{^{2^2}}+......+\frac{3}{2^{100}}\)
Tính :
a) (1+2+3+..+2017+2018).(\(\frac{3}{1.2}+\frac{3}{2.3}+...+\frac{3}{2018.2019}\)) . \(\left(\frac{1}{2}-\frac{1}{3}-\frac{1}{6}\right)\)
b) A= \(1.2.3+2.3.4+3.4.5+...+x.\left(x+1\right).\left(x+2\right)\)
\(\left(\frac{1}{2}-1\right):\left(\frac{1}{3}-1\right):...:\left(\frac{1}{50}-1\right)\)
\(\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+..+\frac{1}{98.99.100}\)
\(\left(1-\frac{1}{2^2}\right).\left(1-\frac{1}{3^2}\right).\left(1-\frac{1}{4^2}\right)....\left(1-\frac{1}{10^2}\right)\)
Giải giúp mình với đang cần gấp
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 giá trị biểu thức:
a) \(A=1+\frac{1}{2}+\frac{1}{2^2}+\frac{1}{2^3}+...+\frac{1}{2^{2016}}\)
b) \(B=-\frac{1}{3}+\frac{1}{3^2}-\frac{1}{3^3}+...+\frac{1}{3^{100}}-\frac{1}{3^{101}}\)
c) \(S=\frac{1}{4.7}+\frac{1}{4.7}+...+\frac{1}{2002.2005}\)
d) \(P=\frac{1}{10}+\frac{1}{15}+\frac{1}{21}+...+\frac{1}{120}\)
e) \(Q=\frac{1}{1.2.3}+\frac{1}{2.3.4}+...+\frac{1}{98.99.100}\)
Tính nhanh
a)M=\(\frac{1}{1.2.3}\)+\(\frac{1}{2.3.4}\)+\(\frac{1}{3.4.5}\)+ ............+\(\frac{1}{37.38.39}\)
b)A=\(\frac{1}{3}\)+\(\frac{1}{3^2}\)+\(\frac{1}{3^3}\)+ ..........+\(\frac{1}{3^8}\)
Tính giá trị biểu thức
A=\(\frac{1}{1.2.3}+\frac{1}{2.3.4}+\frac{1}{3.4.5}+....+\frac{1}{48.49.50}\)
B=\(-\frac{3}{5}.\frac{3}{8}+2\frac{3}{5}+\frac{-3}{5}.\frac{5}{8}\)
C=\(1\frac{3}{5}.0,75-\left(\frac{11}{20}-25\%\right):\frac{3}{7}\)
Ai làm nhanh và đúng câu B và C mk sẽ chọn nhé.