Mathematics
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Cookie
  • Member for 2 years, 1 month
  • Last seen more than a month ago
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24
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41
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26
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22
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22
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19
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View all questions and answers
All Questions Answers
Score Newest
question
7
Given $a_1$, find an increasing sequence so that $a_1+\dots+a_k $ divides $ a_1^2+\dots+a_k^2$ for all $k$
Feb 16
question
3
Find the sum of $\frac{1}{\sqrt1+\sqrt3} + \frac{1}{\sqrt3+\sqrt5} + \frac{1}{\sqrt5+\sqrt7} + ... \frac{1}{\sqrt79+\sqrt81}$ [duplicate]
May 4, 2021
question
3
Solving the system $x^2+y^2+x+y=12$, $xy+x+y=-7$
Dec 26, 2021
question
3
Prove that there are no real numbers $a,b,c,d$ such that this system of equations holds.
Feb 26, 2022
question
3
Prove inequality for positive real numbers $x,y,z$
Oct 23, 2022
question
3
Prove $EB=EC$ and that $F,M,G,C$ are concyclic in the given figure
Dec 18, 2022
question
2
Let $x,y,z$ be positive real numbers such that $x^2+y^2+z^2=xyz$. Prove the following $xyz\geq27,xy+yz+zx\geq27,x+y+z\geq9$
Nov 17, 2021
question
2
Solve this system of equations for real numbers
Dec 15, 2021
question
1
Let $AB$ be the chord of circle $k$ with a centre $O$. Through an arbitrary point $P$ on chord $AB$ is constructed a line $OP$....
Nov 6, 2021
question
1
For positive real numbers $a,b,c$ such that $a+b+c=1$. Prove that...
Nov 18, 2021

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