数学
Of making many books there is no end; and much study is a weariness of the flesh. —— Ecclesiastes Chapter 12
1. 初中数学
1.1 初一数学
1.2 初二数学
1.3 初三数学
探照灯模型是定角定高，我们思维发散一下，思考：定底定高，求顶角的最大值。
Of making many books there is no end; and much study is a weariness of the flesh. —— Ecclesiastes Chapter 12
探照灯模型是定角定高，我们思维发散一下，思考：定底定高，求顶角的最大值。