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 Jul 2 awarded Curious Oct 4 awarded Yearling Apr 4 revised Prove $|\vec{a_1}-\vec{b}|+ \cdots +|\vec{a_n}-\vec{b}| > n$ added 1 characters in body; edited title Apr 4 comment Prove $|\vec{a_1}-\vec{b}|+ \cdots +|\vec{a_n}-\vec{b}| > n$ I try $|\overrightarrow{{{a}_{1}}}-\vec{b}|+\cdots +|\overrightarrow{{{a}_{n}}}-\vec{b}|\ge |\overrightarrow{{{a}_{1}}}+\cdots +\overrightarrow{{{a}_{n}}}-n\vec{b}|=|n\vec{b}|>n$，but I use $|\overrightarrow{b}|>1$,not use $|\vec{a_i}|>1$, Apr 4 asked Prove $|\vec{a_1}-\vec{b}|+ \cdots +|\vec{a_n}-\vec{b}| > n$ Mar 28 asked If $x^9-x^5+x-2=0$ , how to prove $\sqrt[11]{3}0$,$b>0$, thanks. Mar 26 revised How to prove ${{a}^{a}}{{b}^{b}}\ge {{\left(\frac{a+b}{2}\right)}^{a+b}}$ ?thanks. added 14 characters in body Mar 26 asked How to prove ${{a}^{a}}{{b}^{b}}\ge {{\left(\frac{a+b}{2}\right)}^{a+b}}$ ?thanks. Mar 21 accepted how to prove $\frac{a}{1+b+c}+\frac{b}{1+c+a}+\frac{c}{1+a+b}+(1-a)(1-b)(1-c)\le 1$ Mar 21 comment how to prove $\frac{a}{1+b+c}+\frac{b}{1+c+a}+\frac{c}{1+a+b}+(1-a)(1-b)(1-c)\le 1$ thank you very much Mar 20 asked how to prove $\frac{a}{1+b+c}+\frac{b}{1+c+a}+\frac{c}{1+a+b}+(1-a)(1-b)(1-c)\le 1$ Mar 8 asked If $\sqrt{3}x-y<0$ , $x-\sqrt{3}y+2<0$ , $y\ge 0$, are known, how to calculate the range of $\frac{\sqrt{3}x+y}{\sqrt{{{x}^{2}}+{{y}^{2}}}}$. Mar 6 accepted prove $\frac{1}{13}<\frac{1}{2}\cdot \frac{3}{4}\cdot \frac{5}{6}\cdot \cdots \cdot \frac{99}{100}<\frac{1}{12}$ Mar 6 awarded Nice Question Mar 6 asked prove $\frac{1}{13}<\frac{1}{2}\cdot \frac{3}{4}\cdot \frac{5}{6}\cdot \cdots \cdot \frac{99}{100}<\frac{1}{12}$ Mar 2 accepted Calculate $1\times 3\times 5\times \cdots \times 2013$ last three digits. Mar 2 asked Calculate $1\times 3\times 5\times \cdots \times 2013$ last three digits.