Cho A=2/1.4/3.6/5.8/7.....200/199.Chứng minh 14<A<20
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Cho A=2/1.4/3.6/5.8/7.....200/199.Chứng minh 14<A<20.các anh cj khóa trên giúp vssssssssssssss
Cho E= 2/1.4/3....200/199
C/m 101< S.S < 400
Cho A=2/1.4/3.6/5....200/199
c/n 101<S2<400
Cho A=\(\frac{2}{1}.\frac{4}{3}.\frac{6}{5}...\frac{200}{199}CMR:14< A< 20\)
CMR: \(14< \frac{2}{1}.\frac{4}{3}.\frac{6}{5}....\frac{200}{199}< 20\)
chung minh rang 1-1/2+1/3-1/4+...+1/99-1/200=1/101+1/102+...+1/199+1/200
(a+3):199=(b+2):200=(c+1):2001 .CMR: (a-b+1)*(b-c+1)=(a-c+2)^2
Cho:
A=1/2+1/3+1/4+...+1/200
B = 1/199+2/198+3/197+...+ 197/3+198/2+199/1
Tinh A/B
Bai nay kho nen cac ban giai giup minh nha minh tich dung cho