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新课的引入是一个学问,也是一门教学艺术。如何通过引入激发学生的思维和求知欲望,使引入的新课起到“一石激起千层浪”的教学效果。《数学课程标准(实验稿)》
The introduction of new course is a knowledge, but also a teaching art. How to introduce the new lesson into the teaching effect of inspiring a thousand waves by introducing the idea of stimulating students and seeking knowledge. “Mathematics Curriculum Standard (experimental draft)”