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一、提出问题师:我们已学过平面图形面积计算方法。今天老师带来一道题,看大家会不会做。(师出示题目:学校大门口有一块长24米,宽18米长方形花坛,现要在花坛内任意修建一个直径为4米的圆形水池,水池外平均分成两份栽上两种不同花卉。问每种花卉占地面积是多少?)(π取3)生1:列式是:[24×18-3×(4÷2)×(4÷2)]÷2=36(平方米)生2:列式是:[24×18-3×(4÷2)]÷2=36(平方
First, ask the question division: We have learned flat area calculation method. Today, the teacher brought a question to see if everyone would do it. (The teacher shows the title: The school gate has a 24-meter-long and 18-meter-wide rectangular flower beds. A circular pool of 4 meters in diameter is to be built arbitrarily in the flower bed. Two different types of flowers are planted outside the pool. Ask what is the area of each flower?) (Π 3) Health 1: The formula is: [24 × 18-3 × (4 ÷ 2) × (4 ÷ 2)] ÷ 2 = 36 Health 2: The formula is: [24 × 18-3 × (4 ÷ 2)] ÷ 2 = 36 (square