Top network posts
- 9 Prove that $(a+b)(b+c)(c+a) \ge8$
- 6 Find all triples $(p; q; r)$ of primes such that $pq = r+ 1$ and $2(p ^ 2+q ^ 2) =r ^ 2 + 1$.
- 6 Prove that the circumcenter of $\triangle PIQ$ is on the hypotenuse $AC$.
- 6 In how many ways can the ball come back to $A$ after seven passes?
- 6 Is it possible to calculate the arithmetic mean from the geometric mean?
- 5 Prove that $ABC$ is equilateral
- 5 Finding range of $m$ in $x^2+mx+6$.
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