\(\Leftrightarrow B=\frac{3}{5}.\left(\frac{1}{1}-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+...+\frac{1}{96}-\frac{1}{101}\right)\)
\(\Leftrightarrow B=\frac{3}{5}.\left(\frac{1}{1}-\frac{1}{101}\right)\)
\(\Leftrightarrow B=\frac{3}{5}.\frac{100}{101}\)
\(\Leftrightarrow B=\frac{60}{101}\)
1,B=\(\frac{3}{1.6}+\frac{3}{6.11}+\frac{3}{11.16}+..............+\frac{3}{96.101}\)
Tính tổng\(S=\frac{3}{1.6}+\frac{3}{6.11}+\frac{3}{11.16}+...+\frac{3}{96.101}\)
Tính tổng: S
\(\frac{3}{1.6}+\frac{3}{6.11}+\frac{3}{11.16}+..+\frac{3}{96.101}\)
a)\(\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+....+\frac{3}{2008.2011}\)\(\) b)\(\frac{-5}{1.6}-\frac{5}{6.11}-\frac{5}{11.16}-......-\frac{5}{2006.2011}\)
tính giá trị các biểu thức sau bằng cách hợp lý
a, (\(6^3\)+ 3 x \(6^2\)+ \(3^3\)) : 13
b, \(\frac{8\frac{3}{19}\cdot5\frac{1}{4}+3\frac{16}{19}\cdot5\frac{1}{4}}{\left(2\frac{14}{17}-2\frac{1}{34}\right).34}\)
c, \(\frac{3}{1.6}\)+ \(\frac{3}{6.11}\)+\(\frac{3}{11.16}\)+....+\(\frac{3}{96.101}\)
làm câu nào cg đc cần gấp
(x+3).(2y-1)=9
S=\(\frac{5^2}{1.6}+\frac{5^2}{6.11}+\frac{5^2}{11.16}+\frac{5^2}{16.21}+\frac{5^2}{21.26}\)
\(\frac{3}{5}va\frac{3+m}{5+m}\) Hãy so sánh 2 số trên
\(\frac{5^2}{1.6}+\frac{5^2}{6.11}+\frac{5^2}{11.16}+\frac{5^2}{16.21}+\frac{5^2}{21.26}+\frac{5^2}{26.31}\) Tính tổng
\(\frac{1}{1.6}+\frac{1}{6.11}+\frac{1}{11.16}+.........+\frac{1}{46.51}\)
Tính A= \(\frac{1}{1.6}+\frac{1}{6.11}+\frac{1}{11.16}+.....+\frac{1}{496.501}\)