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Cho A = \(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{99.100}\)Chứng minh \(\frac{7}{12}\)< A < \(\frac{5}{6}\)
Chứng minh \(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{49.50}=\frac{1}{26}+\frac{1}{27}+\frac{1}{28}+...+\frac{1}{50}\)
Chứng minh rằng:
a)\(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}< \frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{99.100}\)
b)\(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{99.100}< 1-\frac{1}{2.3}\)
Cần gấp, ai nhanh mik tick nha
Bài 1 :
Cho A= \(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+.....+\frac{1}{99.100}\)
Chứng minh rằng : A >\(\frac{7}{12}\)
Cho\(A=\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{99.100}\)
Chứng minh rằng\(\frac{7}{12}\)< A < \(\frac{5}{6}\)
CHO : \(M=\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+.......+\frac{1}{97.98}+\frac{1}{99.100}\)
Chứng Minh: \(\frac{7}{12}< M< \frac{5}{6}\)
Cho A = \(\frac{1}{1.2}+\frac{1}{3.4}+....+\frac{1}{99.100}\)
Chứng minh rằng : \(\frac{7}{12}< A< \frac{5}{6}\)
Cho A =\(\frac{1}{1.2}+\frac{1}{3.4}+....+\frac{1}{99.100}\).
Chứng minh rằng : \(\frac{7}{12}< A< \frac{5}{6}\)
Cho A=\(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+....+\frac{1}{99.100}\)
CMR:\(\frac{7}{12}< A< \frac{5}{6}\)
Cho A = \(\frac{1}{1.2}\)+ \(\frac{1}{3.4}\)+ \(\frac{1}{5.6}\)+ . . . + \(\frac{1}{99.100}\)
Chứng minh rằng \(\frac{7}{12}\) < A < \(\frac{5}{6}\)