So Sánh 2+ 3/4 +8/9 + 15/16 +...+2499/2500 với 50
So sánh A với 50 biết A=2+3/4+8/9+15/16+...+2499/2500
Cho C = 2 + 3/4 + 8/9 + 15/16 + ... + 2499/2500
CMR C > 50
C=3/4*8/9*15/16...2499/2500
Cho B = 3 /4+8 /9+15/ 16+...+2499 /2500. CMR B ko phai so nguyen
3^4*8^9*15^16*24^25*...2499^2500
Cho \(H=2+\frac{3}{4}+\frac{8}{9}+\frac{15}{16}+...+\frac{2499}{2500}.\) Chứng minh rằng H > 50 .
Cmr 3/4 + 8/9 + 15/16 + ... + 2499/2500 > 48