cherry8.8vanilla
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2 answers
4 votes
305 views
1 bookmarks
Arithmetic sequence and a rectangular triangle
6 answers
3 votes
372 views
Show that $7\mid(3^{2n+1}+2^{n+2})$ for all $n\in\mathbb{N}$
2 answers
3 votes
103 views
An exponential inequallity $2^x > 1-x$
1 answers
2 votes
185 views
Extremal problem
3 answers
2 votes
82 views
1 bookmarks
How to prove that $\frac{a^n}{a^m}$ is equal to $a^{n-m}$?
1 answers
1 votes
693 views
Maximizing the volume of the box obtained by folding the flaps after cutting out squares from each corner of a square
1 answers
0 votes
185 views
A limit to infinity with four different roots: $\lim_{n \to \infty} \frac{\sqrt{n}+ \sqrt[4]{n^2+n}}{\sqrt[6]{n^3-1}+\sqrt[3]{n+2}}$
1 answers
0 votes
35 views
$|2- (\sqrt{n^2+4n} - n)| ≥ \frac{1}{10}$
3 answers
0 votes
175 views
1 bookmarks
Set question - $ ℤ^+ = ℕ$
4 answers
0 votes
60 views
How to get from $-1\le\frac{1}{2a}\le1$ this $-1\ge2a\ge1 $?
2 answers
0 votes
40 views
Task with local extreme
1 answers
0 votes
138 views
A limit to infinity
1 answers
-1 votes
456 views
Draw a set of values in complex plane where the complex number $w=1-3i$ is pure imaginary number.