CMR: 1+1/2+1/3+1/62+1/63+1/64> 4
Những câu hỏi liên quan
CMR 1+1/2+1/3+...+1/62+1/63+1/64 > 4
cmr:1+1/2+1/3+...+1/62+1/63+1/64>4
CMR:M=1+1/2+1/3+..+1/62+1/63+1/64>4
CM : 1+ 1/2+1/3+1/4+1/5+.....+1/62+1/63+1/64 > 4
Chứng tỏ rằng 1+1/2+1/3+1/4+...+1/62+1/63+1/64>4
Ta có: A = 1/2+1/3+1/4+...+1/62+1/63+1/64
A = 1+(1/2+1/3+1/4)+(1/5+1/6+1/7+1/8)+(1/9+1/10+...+1/16)+...+(1/17+1/18+....+1/32)+(1/33+1/34+...+1/64)
Ta có: 1/2+1/3+1/4>1/2+1/4+1/4=1
1/5+1/6+1/7+1/8>1/8+1/8+1/8+1/8=1/8.4=1/2
1/9 +1/10+...+1/16>1/16+1/16+...1/16=1/16.8=1/2
1/33+1/34+...+1/64>1/64+1/64+...+1/64=1/64.32=1/2
Vậy A > 4
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Ta có A = 1 + 1/2 + 1/3 + 1/4 + 1/5 + ... + 1/64
A = 1 + (1/2 + 1/3 + 1/4) + (1/5 + 1/6 + ... + 1/8) + (1/9 + 1/10 + 1/11 + ... + 1/16) + (1/17 + 1/18 + 1/19 + ... + 1/32) + (1/33 + 1/34 + 1/35 + ... + 1/64)
=> A > 1 + (1/2 + 1/4.2) + 1/8.4 + 1/16.8 + 1/32.16 + 1/64.32
A > 1 + 1 + 1/2 + 1/2 + 1/2 + 1/2
A > 4 (DPCM).
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11 tháng 1 2022 lúc 15:04
Chứng tỏ rằng:
\(1+\dfrac{1}{2}+\dfrac{1}{3}+...+\dfrac{1}{62}+\dfrac{1}{63}+\dfrac{1}{64}>4\)
bài 1
chứng tỏ rằng
1+1/2+1/3+................1/62+1/63+1/64>4
các bạn giúp mình nhé, người làm nhanh và đúng sẽ được mình k nhé
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Ta có: A = 1/2+1/3+1/4+...+1/62+1/63+1/64
A = 1+(1/2+1/3+1/4)+(1/5+1/6+1/7+1/8)+(1/9+1/10+...+1/16)+...+(1/17+1/18+....+1/32)+(1/33+1/34+...+1/64)
Ta có: 1/2+1/3+1/4>1/2+1/4+1/4=1
1/5+1/6+1/7+1/8>1/8+1/8+1/8+1/8=1/8.4=1/2
1/9 +1/10+...+1/16>1/16+1/16+...1/16=1/16.8=1/2
1/33+1/34+...+1/64>1/64+1/64+...+1/64=1/64.32=1/2
Vậy A > 4
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1+1/2+1/3+...+1/62+1/63+1/64
Tính: 1 + 1/2 + 1/3 + ... + 1/62 + 1/63 + 1/64