3/4 . 8/9 . 15/16 . ... . 2499/2500=?
Tinh tich
C=3/4*8/9*15/16...2499/2500
3^4*8^9*15^16*24^25*...2499^2500
Chứng minh rằng A=\(\dfrac{3}{4}+\dfrac{8}{9}+\dfrac{15}{16}+...+\dfrac{2499}{2500}>48\)
So sánh A với 50 biết A=2+3/4+8/9+15/16+...+2499/2500
Cmr 3/4 + 8/9 + 15/16 + ... + 2499/2500 > 48
Tính tich :
\(A=\frac{3}{4}.\frac{8}{9}.\frac{15}{16}...\frac{2499}{2500}\)
B=2+3/4+8/9+15/16+.....+2499/2500>50
CMR M=3/4+8/9+15/16+..+2499/2500>48