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访友脚印
星期二 
“分数”与“份数”分数应用题的教学始终是教学中的一道坎。学生对具体量和分率这两个概念不能有效的建立。基础性的找单位“1”，写数量关系等式的方法也反复尝试，效果仍然不佳。
没法，我经常把分数拆成分数让学生理解。
例如：苹果树有1200棵，比梨树的棵数少2/5，梨树有多少棵？就引导：苹果树的棵数比梨树少2/5什么意思，就是梨树有5份，苹果树比它少2份，苹果树有3份。所以1200÷3×5=2000（棵）
这样的教法对于一些理解能力较弱的学生有一定的效果，要求在题目条件上标份数。
不过，这样的教学实际是降低了思维难度，也不利于学生对于分数意义的进一步建立。只是有时讲顺了，不由自主的就到了这个方法。
沈东波 发表于：2011-4-26 20:27:39
理想的には、事前に購読服に年間約前十二から十への結婚式でドレス オーダーヶ月を見て起動する必要があります。これは、あなたが、花を右にアクセサリーを見つけるために変換を実行するのに十分な時間を、髪、服に合わせて提供されます。まだラックブライダルドレスをオフに購入する必要がある、花嫁を変更するためには何らかの仕事を持っているが、彼らが得ることができる6〜9カ月前にウェディングドレスを注文する;約3ヶ月は、部品を変更するには、最初と最後の時間を許可する必要があります。ドレス オーダーもそう今年は望ましいが、3つまたは4つの部品が必要です、長い時間のための特別な必要があるでしょう。花嫁はその衣は失望に到着した場合は、それらに代わるものを見つけるために早めの一年間する必要がありますカラードレス販売、オンライン注文、または事前に愛されドレス腕時計です。
怕博吧嘎 发表于：2011-4-28 10:36:57
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码确 发表于：2018-9-5 21:50:52
