Mathematics
Đào Thanh Oai's user avatar
Đào Thanh Oai's user avatar
Đào Thanh Oai's user avatar
Đào Thanh Oai
  • Member for 5 years, 8 months
  • Last seen this week
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answers
9
questions
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Score
3
Posts
33
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Score
3
Posts
33
Posts %
0
Score
3
Posts
33
Posts %
0
Score
3
Posts
33
Posts %
0
Score
2
Posts
22
Posts %
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Score
2
Posts
22
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Top posts
All Questions Answers
Score Newest
question
3
$\pi(x.y) \ge \pi(x).\pi(y)$ holds for $x, y \ge 8$
Jun 26, 2018
question
3
An identity associated with the centroid of a triangle
Jun 18, 2019
question
3
A generalization of Sawayama theorem
Jul 11, 2020
question
1
$n$ is a positive prime number if only if $k^{n-1} \equiv 1$ mod $n$ with $1 < k < n$?
Sep 21, 2019
question
1
Is it true that if $a, b, x, y>0$, $a+b \ge x+y$ and $ab \le xy$ then $a^n+b^n≥x^n+y^n$ for $n>1$?
Feb 3
question
0
How can prove that centroids of three equilateral triangles are collinear
Apr 1, 2018
question
0
Let $A_1A_2....A_n$ be the regular polygon incribed a circle $(O)$ with radius $R$ what is value $k=\frac{\sum_{i<j} A_iA_j^\alpha}{R^\alpha}$?
Jul 1, 2020
question
0
Is $\cos^2(x)-\sin^2(x)=2\cos(x)\cos\left(x+\frac{\pi}{3}\right)+2\sin(x)\sin\left(\frac{\pi}{3}-x\right)$ new?
Oct 31, 2021
question
-1
Is there any prime number $a$ satisfying $a=\frac{k_1-k_2}{k_1-bk_2}$? [closed]
Sep 20, 2019
Top network posts
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18
An ellipse through 12 points related to Golden ratio
17
Is every odd positive integer of the form $P_{n+m}-P_n-P_m$?
14
Is it a new discovery on conic section?
12
An open triangle problem in plane geometry
11
Do two new special points in any triangle exist?

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