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Mathematics
Du Doudou's user avatar
Du Doudou's user avatar
Du Doudou's user avatar
Du Doudou
  • Member for 1 year, 5 months
  • Last seen more than a week ago
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欲买桂花同载酒，终不似，少年游。

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4
Posts
67
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10
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17
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Top posts

11
Prove that $\left(a+b+c+d-\frac{98}{25}\right)^2+\frac{108}{25}abcd\ge\frac{2704}{625}$ for $\frac1{1+a}+\frac1{1+b}+\frac1{1+c}+\frac1{1+d}=2$
Jun 29
6
Olympiad-Level Optimization Problem Without Calculus
May 31
4
Prove that $a^2+b^2+c^2+5abc\geq8$
May 28
3
Proving an inequality including $\sum a\sqrt{(a+b)(a+c)}$
Jun 1
1
Prove this recurrence relation for $I_n=\int_0^\infty\frac{\operatorname du}{(1+u^2)^n}$ [duplicate]
Jun 15, 2024
1
Combinatorics proof for this probability equation
Jul 3