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【教学片断1】1.结合情境初步体验含有字母式子的化简。出示例题:小华用小棒摆了ɑ个三角形,小芳用小棒摆了ɑ个正方形。你会用含有字母的式子表示小华和小芳一共用了多少根小棒吗?学生自主思考后交流。生1:摆一个三角形要用3根小棒,ɑ个三角形要用3ɑ根小棒,摆一个正方形要用4根小棒,ɑ个正方形要用4ɑ根小棒,一共要用3ɑ+4ɑ根小棒。生2:把一个三角形和一个正方形看成一组,要用7根小棒,摆ɑ个三角形和ɑ个正方形共ɑ组,一共要用7ɑ根小棒。教师利用课件分别动态展示学生的
【Teaching 1】 fragment 1. First experience with a combination of situations containing the reduction of the letter type. Sample example: Xiaohua put a triangle with a small stick, Xiaofang put a small bar with a square. You will use the formula with letters that Xiaoguang Xiaofang and how many share a small stick it? Students think after exchange. Health 1: put a triangle to use 3 small sticks, a triangle to use 3 ɑ root sticks, put a square to use 4 sticks, ɑ a square to use 4 ɑ root sticks, a total of 3 ɑ +4 ɑ root Little stick. Students 2: A triangle and a square as a group, to use seven small sticks, put a triangle and a square a total of ɑ group, a total of 7 ɑ need to use a small stick. Teachers use courseware to dynamically show students