\(A=\left(1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{99}-\frac{1}{100}\right)\)
\(B=\frac{1}{2}\left(\frac{1}{2}-\frac{1}{4}+\frac{1}{6}-\frac{1}{8}+....+\frac{1}{198}-\frac{1}{200}\right)\)
= \(\frac{1}{2}.\frac{1}{2}\left(1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+....+\frac{1}{99}-\frac{1}{100}\right)\)
Giờ thì A/B bằng mấy e ?
Cho A=1/1.2+1/3.4+1/5.6+1/7.8+.....+1/99.100
và B=1/2.4+1/6.8+1/10.12+1/14.16+.....+1/198.200
khi đó tỉ số A/B=?
cho \(A=\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+\frac{1}{7.8}+...+\frac{1}{99.100}\)và \(B=\frac{1}{2.4}+\frac{1}{6.8}+\frac{1}{10.12}+\frac{1}{14.16}+...+\frac{1}{198.200}\)Khi đó tỉ số \(\frac{A}{B}\)=.........
Cho A=\(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+\frac{1}{7.8}+...+\frac{1}{99.100}v\text{à}B=\frac{1}{2.4}+\frac{1}{6.8}+\frac{1}{10.12}+\frac{1}{14.16}+...+\frac{1}{198.200}\) khi đó tỉ số\(\frac{A}{B}\)=
Giúp mình với
Cho A= \(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+.............+\frac{1}{99.100}\)
VÀ: B=\(\frac{1}{2.4}+\frac{1}{6.8}+\frac{1}{10.12}+\frac{1}{14.16}+...........+\frac{1}{198.200}\)
KHI ĐÓ TỈ SỐ \(\frac{A}{B}\)= ??????????????
TICK 2 CÁI LUÔN
Cho A\(=\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+\frac{1}{7.8}+...+\frac{1}{99.100}\)
B\(=\frac{1}{2.4}+\frac{1}{6.8}+\frac{1}{10.12}+\frac{1}{14.16}+...+\frac{1}{198.200}\)
Tim ti so \(\frac{A}{B}\)
Cho A= 1/ 1.2+ 1/ 3.4+ 1/ 5.6+ 1/ 7.8+.... +1/99.100
CMR:7/12< A<5/6
mong các bạn giúp đỡ mình
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
a) A = 1/1.2+ 1/3.4+ 1/5.6+...+ 1/99.100
CMR: 7/12<A< 5/6
b) CMR: 1/1.2+ 1/3.4+ 1/5.6+...+1/49.50 = 1/26+ 1/27+ 1/28+...+1/50
Cho A = 1/(1.2) +1/(3.4) +1/(5.6) +....+1/(99.100)
B= 2011/51 +2011/52+ 2011/53 +...+2011/100
CM: B/A là số nguyên
