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\(A=\frac{1}{1\cdot2}+\frac{1}{3\cdot4}+\frac{1}{5\cdot6}+...+\frac{1}{99\cdot100}\)
CMR 7/12<A<5/6
\(A=\frac{1}{1\cdot2}+\frac{1}{3\cdot4}+\frac{1}{5\cdot6}+\frac{1}{99\cdot100}.CM:\frac{7}{12}< A< \frac{5}{6}\)
Cho A=\(\frac{1}{1\cdot2}+\frac{1}{3\cdot4}+\frac{1}{5\cdot6}+......+\frac{1}{99\cdot100}\)CMR:\(\frac{7}{12}\)<A<\(\frac{5}{6}\)
CMR A<\(\frac{5}{6}\)voi A=\(\frac{1}{1\cdot2}\)+\(\frac{1}{3\cdot4}\)+\(\frac{1}{5\cdot6}\)+...+\(\frac{1}{99\cdot100}\)
CMR A<\(\frac{5}{6}\)voi A=\(\frac{1}{1\cdot2}\)+\(\frac{1}{3\cdot4}\)+\(\frac{1}{5\cdot6}\)+...+\(\frac{1}{99\cdot100}\)
Cho \(A=\frac{1}{1\cdot2}+\frac{1}{3\cdot4}+\frac{1}{5\cdot6}+...+\frac{1}{99\cdot100}.\)
Chứng minh rằng: \(\frac{7}{12}\)< A < \(\frac{5}{6}\)
Cho \(A=\frac{1}{1\cdot2}+\frac{1}{3\cdot4}+\frac{1}{5\cdot6}+....+\frac{1}{99\cdot100}\)
\(B=\frac{1}{50}+\frac{1}{51}+\frac{1}{52}+.....+\frac{1}{100}\)
Khi đó A-b=????
cho A=\(\frac{1}{1\cdot2}+\frac{1}{3\cdot4}+\frac{1}{5\cdot6}+....+\frac{1}{90\cdot100}\)
chứng minh rằng: 7/20<A<5/16
Cho A=\(\frac{1}{1\cdot2}+\frac{1}{3\cdot4}+\frac{1}{5\cdot6}+........+\frac{1}{99\cdot100}\)và B=\(\frac{1}{50}+\frac{1}{51}+\frac{1}{52}+.......+\frac{1}{100}\)khi đó A-B =.......? ai giải thích hộ mk vs nhá. thanks