So sánh A và 1 :
\(A=\frac{1}{2.2}+\frac{1}{3.3}+\frac{1}{4.4}+...+\frac{1}{10.10}\)
Giup mk tich cho
\(\frac{1}{2.2}\)+\(\frac{1}{3.3}\)+...........+\(\frac{1}{100.100}\)so sanh voi 1
S=\(\frac{1}{2.2}+\frac{1}{3.3}+\frac{1}{4.4}+\frac{1}{5.5}+...+\frac{1}{49.49}+\frac{1}{50.50}\)=?
Cho :A= \(\frac{1}{2.2}\) +\(\frac{1}{3.3}\) +\(\frac{1}{4.4}\)+....\(\frac{1}{1009.1009}\)
CMR A<\(\frac{3}{4}\)
\(\frac{1}{2.2}+\frac{1}{3.3}+\frac{1}{4.4}+...+\frac{1}{1010.1010}\)< 1. Chúng tỏ tổng này nhỏ hơn 1
chứng tỏ \(\frac{1}{2.2}\) + \(\frac{1}{3.3}\) + .........+ \(\frac{1}{100.100}\) < 1
Tính:
\(C=\) \(\frac{1.1!}{1!.2!}+\frac{2.2!}{2!.3!}+\frac{3.3!}{3!.4!}+......+\frac{100.100!}{100!.101!}\)
tinh : A = (1 - 1/2.2) . (1 - 1/3.3) . (1 - 1/4.4)...(1 -1/100.100)
Chứng minh rằng:
a) A= 1/ 2.2 + 1/3.3 + 1/4.4 +....+ 1/100.100 < 1