Nhớ k cho mình nhé bạn
Ta có: Gọi dãy số cần chứng minh là A
\(A<\left(\frac{1}{30}+\frac{1}{30}+\frac{1}{30}\right)+\left(\frac{1}{60}+\frac{1}{60}+\frac{1}{60}+\frac{1}{60}\right)\)
\(A<\frac{1}{3}+\frac{3}{30}+\frac{4}{60}\)
\(A<\frac{10}{30}+\frac{3}{30}+\frac{2}{30}\)\(\)
\(A<\frac{13}{30}+\frac{2}{30}\)
\(A<\frac{15}{30}=\frac{1}{2}\)
Vậy \(A<\frac{1}{2}\)
chung minh rang
1/3+1/31+1/35+1/37+1/47+1/53+1/61<1/2
chứng minh rằng: 1/3+1/31+1/35+1/37+1/47+1/53+1/61<1/2
Chứng minh rằng:
1/3 + 1/31 + 1/35 + 1/37 + 1/47 + 1/53 + 1/61<1/2
Chứng minh rằng:
1/3 + 1/31 + 1/35 + 1/37 + 1/47 + 1/53 + 1/61< 1/2
Chứng minh rằng
1/3+ 1/31+1/35+1/37+1/47+1/53+1/61<1/2
so sanh : 1/3+1/31+1/35+1/37+1/47+1/53+1/61 va 1/2
cmr
1/3+1/31+1/35+1/37+1/47+1/53+1/61<1/2
Chứng minh rằng:
\(\frac{1}{3}+\frac{1}{31}+\frac{1}{35}+\frac{1}{37}+\frac{1}{47}+\frac{1}{53}+\frac{1}{61}< \frac{1}{2}\)
Chứng minh rằng:
\(\frac{1}{3}+\frac{1}{31}+\frac{1}{35}+\frac{1}{37}+\frac{1}{47}+\frac{1}{53}+\frac{1}{61}\le\frac{1}{2}\)