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Topic: Some help with problems
Replies: 4   Last Post: Jun 22, 2013 3:52 AM

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Nikola_lion

Posts: 1
From: China
Registered: 6/14/13
Re: Some help with problems
Posted: Jun 14, 2013 11:23 PM
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the fifth problem is wrong
because (3/2) < ( (2^571 +3) / (3^247 + 2)) rather than">"
It is same as:
2^572>3^248 2^143>3^62
there are two ways for you
the first:
143 ln2>62 ln3
so we want to prove (ln2)/(ln3)>62/143
as is known to all ln2>0.7 ln3<1.1
then (ln2)/(ln3)>0.64
0.64>0.5>62/143
the second way:
3^62<2^143=2*4^71
3^62<4^71 so It is correct
the seventh problem:
I am so sorry that I cannot understand your meaning.
rhombus is also a kind of parallelogram.



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