1:cho A=\(\frac{1}{7}\) +\(\frac{1}{13}\) +\(\frac{1.}{25}\) +\(\frac{1}{49}\) +\(\frac{1}{97}\)

hay so sanh tong A voi 13 

giup minh nha.

minh cho 3 tich.

Cho A=1/7+1/13+1/25+1/49+1/97.

hay so sanh tong A voi 1/3

So sánh tổng A với \(\frac{1}{3}\):

A =\(\frac{1}{7}+\frac{1}{13}+\frac{1}{25}+\frac{1}{49}+\frac{1}{97}\)

\(\frac{1}{7}+\frac{1}{13}+\frac{1}{25}+\frac{1}{49}+\frac{1}{97}=A\).so sánh A và \(\frac{1}{3}\)

Điền dấu thích hợp vào chỗ chấm :

\(\frac{1}{7}+\frac{1}{13}+\frac{1}{25}+\frac{1}{49}+\frac{1}{97}.....\frac{1}{3}\)

Giup mk tich cho

\(\frac{1}{2.2}\)+\(\frac{1}{3.3}\)+...........+\(\frac{1}{100.100}\)so sanh voi 1

So sánh \(A\)với\(13\),biết rằng:

\(A=\frac{13}{15}+\frac{7}{5}+\frac{3}{4}+\frac{1}{5}+\frac{1}{7}+\frac{19}{20}+\frac{5}{4}+\frac{1}{3}+\frac{1}{6}+\frac{1}{13}+\frac{17}{23}+\frac{9}{8}+\frac{2}{5}+\frac{1}{7}+\frac{1}{25}+\frac{3}{2}+\frac{1}{8}+\frac{1}{19}+\frac{1}{9}+\frac{1}{97}\)

a,\(\frac{0,75-0,6+\frac{3}{7}+\frac{3}{13}}{2,75-2,2+\frac{11}{7}+\frac{11}{13}}\)

b,\(\frac{5}{9}:\left(\frac{1}{3}+\frac{1}{4}\right)+\frac{5}{9}:\left(\frac{1}{9}+\frac{2}{3}\right)\)

giup minh voi!!!!

Hãy so sánh \(A\) với \(\frac{31}{6}\)biết rằng:\(A=\frac{1}{7}+\frac{1}{4}+\frac{2005}{2006}+\frac{1}{13}+\frac{1}{9}+\frac{2006}{2007}+\frac{1}{25}+\frac{1}{16}+\frac{2007}{2008}+\frac{1}{49}+\frac{1}{25}+\frac{2008}{2005}+\frac{1}{97}+\frac{1}{36}\).