Chứng minh:
a) 1/22 +1/32+ 1/42+.......+1/n2 Bé hơn 1
b) 1/4 + 1/16 + 1/36 + 1/64 + 1/100 + 1/144 + 1/196 bé hơn 1/2
Cho A=1/4+1/16+1/36+1/64+1/100+1/144+1/196. Chứng minh rằng A < 1/2
1. chứng minh
\(\dfrac{1}{4}\)+ \(\dfrac{1}{16}\)+ \(\dfrac{1}{36}\)+\(\dfrac{1}{64}\)+\(\dfrac{1}{100}\)+\(\dfrac{1}{144}\)+\(\dfrac{1}{196}\)≤\(\dfrac{1}{2}\)
2.tìm số nguyên n sao cho (3n +24) \(⋮\) (n-4)
cứu t zới!!!huhu
chứng minh rằng a 1/4 +1/16+1/36+1/64+1/100+1/144 +1/196+......+1/10000 <1/2
Chứng minh rằng A = 1/4+1/16+1/36+1/64+1/100+1/144+1/196+1/256+1324 < 1/2
Chứng minh
a)A = 1/22 + 1/32 + 1/42 + ... + 1/20152 < 1
b) B = 1/4 + 1/16 + 1/36 + 1/64 + 1/100 + 1/144 + 1/196 < 1/2
Chứng minh rằng:
a) \(\frac{1}{2^2}+\frac{1}{3^2}+\frac{1}{4^2}+..+\frac{1}{n^2}< 1\)
b) \(\frac{1}{4}+\frac{1}{16}+\frac{1}{36}+\frac{1}{64}+\frac{1}{100}+\frac{1}{144}+\frac{1}{196}< \frac{1}{2}\)
Các bn giúp mk nha! mk cần gấp trong hôm nay! Thanks nhiều!^_^
CMR :
a, \(\frac{1}{2^2}+\frac{1}{3^2}+....+\frac{1}{n^2}< 1\)
b, \(\frac{1}{4}+\frac{1}{16}+\frac{1}{36}+\frac{1}{64}+\frac{1}{100}+\frac{1}{144}+\frac{1}{196}< \frac{1}{2}\)
Cho
A= 1/4+1/16+1/36+1/64+1/100+1/144+1/196+1/256+1/324+1/400. Chứng minh A < 1/20