1/1.3-1/2.4+1/3.5-1/4.6+...+1/97.99-1/98.100 = ?
1/3.10+1/10.17+......+1/73.80 - 1/2.9 - 1/9.16 - 1/16.23 - 1/23.30 = ?
chứng minh rằng:1/1.3 + 1/2.4 + 1/3.5 + 1/4.6 +....+ 1/97.99 + 1/98.100 < 3/4
chứng minh rằng 1^1.3 + 1^2.4 + 1^3.5 + 1^4.6 +...+ 1^97.99+ 1^98.100 < 3^4
Chứng minh rằng: \(\frac{1}{1.3}+\frac{1}{2.4}+\frac{1}{3.5}+\frac{1}{4.6}+...+\frac{1}{97.99}+\frac{1}{98.100}< \frac{3}{4}\)
1/1.3+1/2.4+1/3.5+....+1/97.99+1/98.100 <3/4
Cho S=1/1.3+1/2.4+1/3.5+....+1/97.99+1/98.100.
So sánh S và 1.
1/3.4+1/2.4+1/3.5+....+1/97.99+1/98.100<3/4
tính
a,(1+8/10).(1+8/22).(1+8/36).(1+8/52)................(1+8/8352)
b,2.4+3.5+4.6+5.7+6.8+...............+97.99+98.100
tìm GTNN của A= |x^2+5| +(2y-3)\(^4\)