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在小学算术课中,老师们教到两位除法时,常常感到学生不会求商数的困难,其原因就是学生缺乏两位乘一位心算练习的准备。因此,心算是低年级算术教
In primary school arithmetic classes, teachers often find it difficult for students to ask for quotation when teaching two divisions. The reason for this is that students lack the preparation for taking two mental arithmetic exercises. Therefore, mental arithmetic is the lower grade arithmetic teaching