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                      學習幫首頁  APP版  
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                      • 年級

                      • THIRD GRADE
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                      抽屜原理

                      2016/6/18 15:07:52 來源: 學習幫

                      一、知識點介紹抽屜原理有時也被稱為鴿籠原理,它由德國數學家狄利克雷首先明確提出來并用來證明一些數論中的問題,因此,也被稱為狄利克雷原則.抽屜原理是組合數學中一個重要而又基本的數學原理,利用它可以解決很多有趣的問題,并且常常能夠起到令人驚奇的作用.許多看起來相當復雜,甚至無從下手的問題,在利用抽屜原則...

                      • 年級

                      • FIFTH GRADE
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                      速算與巧算

                      2016/10/31 20:21:31 來源: 學習幫

                      教學目標:1. 理解牛吃草這類題目的解題步驟,掌握牛吃草問題的解題思路.2. 初步了解牛吃草的變式題,會將一些變式題與牛吃草問題進行區別與聯系知識點撥:英國科學家牛頓在他的《普通算術》一書中,有一道關于牛...

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                      牛吃草問題見解

                      2016/10/31 20:24:16 來源: 學習幫

                      教學目標:1. 理解牛吃草這類題目的解題步驟,掌握牛吃草問題的解題思路.2. 初步了解牛吃草的變式題,會將一些變式題與牛吃草問題進行區別與聯系知識點撥:英國科學家牛頓在他的《普通算術》一書中,有一道關于牛...

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