Tính:
\(\dfrac{1}{99.97}-\dfrac{1}{97.95}-....-\dfrac{1}{5.3}-\dfrac{1}{3.1}\)
Giúp mk vs nak!!!
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Tính:
D=(1-1/1.2)+(1-1/2.3)+....+(1-1/2015.2016)
Chứng minh rằng 1/1.2 + 1/2.3 + 1/3.4 +........+1/49+50 = 1/26 + 1/27 +1/28 +.....+ 1/50
|x+1/1.2|+|x+1/2.3|+|x+1/3.4|+...+|x+1/99.100|=100x
\(1+\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{9.10}\)
tính \(\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{99.100}\)
Bài 1. Tính A = 1.2 + 2.3 + 3.4 + … + n.(n + 1)
Cho A= 1/1.2 +1/2.3 +1/3.4 +......+1/49+50. Chứng minh rằng 7/ 12 < A < 5/6
Cho :A=1/1.2 +1/2.3 + 1/3.4 + .......+1/49+50. Chứng minh rằng 7/12 < A < 5/6.