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题记:“简约”不是简单的压缩和简化,相反,它是一种更深广的丰富,是寓丰富于简单之中。“简约”给人的是一种明了、凝练的感觉,在去繁就简中又极其完美地保留了事物本身的经典内核。——许卫兵(特级教师)案例:如此分类(北师大版四年级下册《方程》教学片断)教师指导学生在具体的购买食品的情境中引出下面的式子:3×5+5×5>20;5×4=20;3x=20;6×2+5<20;3x+3y<20;3×5+5=20;4y+3×2>20;4y+6×2=20;师:这么多式子,有点乱。你能不能按一定的标准
Inscription: “Simple ” is not a simple compression and simplification, on the contrary, it is a more extensive rich, is rich and simple. “Simple ” gives a clear, concise feeling, in the elaboration of Jane and extremely perfect retention of the classic core of the thing itself. - Xu Weibing (super teacher) Case: so classified (Beijing Normal University version of the fourth grade volume “teaching”) teaching students to guide the students in the specific context of the purchase of food leads to the following formula: 3 × 5 +5 × 5 × 20 = 3 × 5 = 20; 4 × 3 = 20; 4 × 4 = 20; 3 × = 20; 6 × 2 + 5 <20; 3 × + 3y <20; 20: teacher: so many formulas, a bit messy. You can not according to a certain standard