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前不久,听了一节“乘法分配律”的研讨课。课一开始,教师便出示如下两组口算题。(2+8)×4 2×4+8×4 (9+11)×6 9×6+11×6 (13+17)×3 13×3+17×3 (14+16)×5 14×5+16×5女生解答左边的一组,男生解答右边的一组,比一比谁算得又对又快。女生很快计算出了结果,老师宣布女生获胜,并顺势导入本节课要学的内容:知道今天女生为什么能获胜吗?这些算式之间到底有什么联系?通过接下去的学习你们就会明白其中的道理。
Not long ago, I listened to a seminar entitled “Law of Multiplication Distribution”. At the beginning of the class, teachers will present the following two sets of oral questions. (2 + 8) × 4 2 × 4 + 8 × 4 (9 + 11) × 6 9 × 6 + 11 × 6 (13 + 17) × 3 13 × 3 + 17 × 3 (14 + 16) × 5 14 × 5 +16 × 5 girls answer a group on the left, the boys answer a group on the right, compared to one who is considered right and fast. Girls quickly calculated the results, the teacher announced the girls won, and homeopathic into the content of this lesson to learn: to know why girls today can win it? What is the relationship between these formulas in the end? Through the next study you will understand One of the truth.