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qiang
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games
2048 fifteen flatris life sudoku sweeper
旋轮线
旋轮线 一个圆在直线上作纯滚动（接触点无滑动），圆上某一点形成的轨迹叫做旋轮线，其参数方程写为 $$ \left\{\begin{array}{cc} x&=&a(\theta-\sin\the...
Menelaus和Ceva定理
Menelaus定理 三角形ABC，D, E, F分别在直线BC, AC, AB上，则D, E, F共线的充分必要条件是：有符号线段比值（反方向取负比值）满足 $$\frac{BD}{DC}\f...
test
test math formula: $$\int_0^\infty\frac{1}{1+x^2}dx=\pi/2$$ $\alpha\lt\beta$，$\gamma\pi$ JXG.Op...
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