Các câu hỏi tương tự
S=1/1.6+1/6.11+1/11.16+.....+1/496.501
S = 1/1.6+1/6.11+1/11.16+...+1/496.501
B= 1/1.6 + 1/6.11 + 1/11.16 + ... + 1/101.106
B=1/1.6+1/6.11+1/11.16+...+1/101.106
\(A=\dfrac{1}{1.6}+\dfrac{1}{6.11}+\dfrac{1}{11.16}+...+\dfrac{1}{496.501}\)
Tính :
E=1/1.6+1/6.11+1/11.16+...+1/496.501
tính tong 100 so hang dau tien cua day: \(\frac{1}{1.6}+\frac{1}{6.11}+\frac{1}{11.16}+\frac{1}{16.21}+.....\)
Chứng minh 1/1.6+1/6.11+1/11.16+...+1/(5n+1)(5n+6)=n+1/5n+6
C = 1/1.6+1/6.11+1/11.16+.....+1/(5n+1).(5n+6) n thuoc N