锐角三角形;
A difference replacement demonstration of the geometric inequalities of acute triangle and the corresponding application program
锐角三角形几何不等式的差分代换证法及应用程序
Every day I feel the sun in the window, shadows, traffic, and changes in acute triangle.
我每天在窗口感受到阳光、影子、车流和锐角三角形的变化。
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