1/3+1/31+1/35+1/37+1/47+1/53+1/61 < 1 / 3 + 3 / 31 + 3 / 47 < 1 / 3 + 3 / 30 + 3 / 45 =
1 / 3 + 1 / 10 + 1 / 15 = 1 / 3 + (1 / 30) * (3 + 2) = 1 / 3 + (1 / 30) * 5 = 1 / 3 + 1 / 6 =
(1 / 6) * (2 + 1) = (1 / 6) * 3 = 1 / 2
so sanh : 1/3+1/31+1/35+1/37+1/47+1/53+1/61 va 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
chung minh rang;
1/3 +1/31 +1/35 +1/37 +1/47 +1/53 +1/61 <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
CMR
\(\frac{1}{3}+\frac{1}{31}+\frac{1}{35}+\frac{1}{37}+\frac{1}{47}+\frac{1}{53}+\frac{1}{61}< \frac{1}{2}\)
CMR
\(\frac{1}{3}+\frac{1}{31}+\frac{1}{35}+\frac{1}{37}+\frac{1}{47}+\frac{1}{53}+\frac{1}{61}< \frac{1}{2}\)
