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教学片段(多媒体依次出示)小红的年龄:a=1a=2a=3小红爸爸的年龄:a+30=1+30a+30=2+30a+30=3+30师:“a=1”是什么意思?这时候的“a+30”呢?“a=2”时呢?“a=3”时呢?(多媒体出示)4 4+30…………a a+30师:想一想,4与a有什么不同?(教室里静悄悄的,学生认真地思考。学生陆续举起手)
A: 1a = 2a = 3 The age of the red dad: a + 30 = 1 + 30a + 30 = 2 + 30a + 30 = 3 + 30 Teacher: “a = What is the meaning of ”1“? What is the meaning of ”a + 30“ at this time? When ”a = 2"? A +30 Teacher: Think about it, what is the difference between 4 and a? (Quiet in the classroom, students think carefully. Students raise their hands one by one)