Bài 1 :Cho A =\(\frac{1}{1.101}\)+\(\frac{1}{2.102}\)+\(\frac{1}{3.103}\)+ . . . +\(\frac{1}{10.110}\)
B =\(\frac{1}{1.11}\)+\(\frac{1}{2.12}\)+\(\frac{1}{3.13}\)+ . . . + \(\frac{1}{100.110}\)
Tính A : B
Bài 2 :Cho A= 1+\(\frac{3}{2^3}\)+\(\frac{4}{2^4}\)+\(\frac{5}{2^5}\)+ . . .+\(\frac{100}{2^{100}}\). Rút gọn A
Tìm x , bíÊt:
\(\frac{1}{1.101}+\frac{1}{2.102}+\frac{1}{3.103}+...+\frac{1}{10.110}x=\frac{1}{1.11}+\frac{1}{2.12}+\frac{1}{3.13}+...+\frac{1}{100.110}\)
Tìm x:
( \(\frac{1}{1.101}+\frac{1}{2.102}+\frac{1}{3.103}+...+\frac{1}{10.110}\) ) . x = \(\frac{1}{1.11}+\frac{1}{2.12}+...+\frac{1}{100.110}\)
Bài 1 : Tìm x biết : ( Giải rõ ràng => like )
\(\left(\frac{1}{1.101}+\frac{1}{2.102}+...+\frac{1}{10.110}\right)x=\frac{1}{1.11}+\frac{1}{2.12}+...+\frac{1}{100.110}\)
\(E=\frac{1}{1.101}+\frac{1}{2.102}+\frac{1}{3.103}+.........+\frac{1}{10.110}\)
\(F=\frac{1}{1.11}+\frac{1}{2.12}+\frac{1}{3.13}+.........+\frac{1}{100.110}\)
tính tỉ số \(\frac{E}{F}\)
Tìm x , biết (\(\frac{1}{1.101}+\frac{1}{2.102}+...+\frac{1}{10.110}\)).x = \(\frac{1}{1.11}+\frac{1}{2.12}+...+\frac{1}{100.110}\)
Tính tỉ số A/B biết:
A\(=\frac{1}{1.101}+\frac{1}{2.102}+...\frac{1}{10.110}\)
B\(=\frac{1}{1.11}+\frac{1}{2.12}+...\)
Help me do my homework !
Cho \(E=\frac{1}{1.101}+\frac{1}{2.102}+\frac{1}{3.103}+....+\frac{1}{10.110}\) và \(\frac{1}{1.11}+\frac{1}{2.12}+\frac{1}{3.13}+.....+\frac{1}{100.110}\)
Tính tỉ số \(\frac{E}{F}\)
Cho
E=\(\frac{1}{1.101}\) + \(\frac{1}{2.102}\) +...+\(\frac{1}{10.110}\)
F=\(\frac{1}{1.11}\)+\(\frac{1}{2.12}\) +...+\(\frac{1}{100.110}\)
Tính \(\frac{E}{F}\)