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一、案例“商不变的规律”教学片断师:(板书:12÷6=2)今天我们就先来研究这道算式。如果我们只改变这道算式中的被除数或除数,商会怎样?生1:商变了。生2:如果只改变被除数,被除数变大,商就会变大;被除数变小,商就会变小。生3:如果只改变除数,除数变大,商就会变小;除数变小,商就会变大。师:如果我们同时改变这道算式的被除数和除数,商会怎
First, the case “business invariant ” teaching fragment teacher: (blackboard: 12 ÷ 6 = 2) Today we first to study this formula. If we only change the dividend or divisor in this formula, how does the Chamber of commerce? Health 2: If you only change the dividend, the dividend becomes larger, the business will become larger; the divisor becomes smaller, the business will become smaller. Health 3: If you only change the divisor, divisor becomes larger, the business will become smaller; divisor becomes smaller, the business will become larger. Teacher: If we change the dividend and the divisor of this formula at the same time, how can the chamber of commerce?