\(A=\frac{1}{11.13}+\frac{1}{13.15}+...+\frac{1}{54.55}\)
\(A=\frac{1}{2}.\left(\frac{1}{11}-\frac{1}{13}+\frac{1}{13}-\frac{1}{15}+...+\frac{1}{54}-\frac{1}{55}\right)\)
\(A=\frac{1}{2}.\left(\frac{1}{11}-\frac{1}{55}\right)\)
\(A=\frac{1}{2}.\frac{4}{55}\)
\(A=\frac{2}{55}\)
\(\frac{1}{11.13}+\frac{1}{13.15}+\frac{1}{15.17}+........+\frac{1}{19.21}\)
\(\frac{1}{9.11}+\frac{1}{11.13}+\frac{1}{13.15}+.....+\frac{1}{61.63}=?\)
Tính :
\(C=\frac{1}{11.13}+\frac{1}{13.15}+\frac{1}{15.17}+...+\frac{1}{2015.2017}\)
Tìm x biết:
a,\(\frac{1}{2a^2+1}:x=2\)
b,\(x-\frac{20}{11.13}-\frac{20}{13.15}-\frac{20}{15.17}.........-\frac{20}{53.55}=\frac{3}{11}\)
c,\(\frac{1}{21}+\frac{1}{28}+\frac{1}{36}+........+\frac{2}{x\left(x+1\right)}=\frac{2}{9}\)
Tìm x biết:
\(x-\frac{20}{11.13}-\frac{20}{13.15}-....-\frac{20}{53.55}=\frac{3}{11}\)
\(\frac{1}{21}+\frac{1}{28}+\frac{1}{36}+....+\frac{2}{x.\left(x+1\right)}=\frac{2}{9}\)
giúp mình với mình tick cho!
x-\(\left(\frac{20}{11.13}+\frac{20}{13.15}+\frac{20}{15.17}+...+\frac{20}{53.55}\right)=\frac{3}{11}\)
\(\frac{1}{3}+\frac{1}{6}+\frac{1}{10}+\frac{1}{15}+...+\frac{2}{x\left(x-1\right)}=\frac{2007}{2009}\)
A)\(\frac{2020.125+1000}{126.2020-1020}\)
B) (\(\frac{1}{11.13}\)+ \(\frac{1}{13.15}\)+ \(\frac{1}{15.17}\)+ \(\frac{1}{17.19}\)+ \(\frac{1}{19.21}\)) . 426 + x =19
cảm ơn
1, Tính giá trị biểu thức
\(A=\frac{5}{1.2}+\frac{5}{2.3}+.......+\frac{5}{99.100}
\)
\(B=\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\)
\(C=\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}+\frac{2}{11.13}+\frac{2}{13.15}\)
1, Tính gái trị biểu thức
\(A=\frac{5}{1.2}+\frac{5}{2.3}+......+\frac{5}{99.100}\)
\(B=\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\)
\(C=\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+\frac{2}{9.11}+\frac{2}{11.13}+\frac{2}{13.15}\)
