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第一部分:探究性学习的教学1.课前预设(理想)。出示一个两边分别是6cm和3cm的平行四边形,要学生求它的面积。想像学生会马上用6×3的类似长方形面积计算的方法来求平行四边形的面积,然后用数格子的方法来验证两边相乘是错误的。由此引导学生的探究——那么该怎样求平行四边形的
The first part: inquiry learning teaching 1 preset (ideal). Show a parallelogram of 6cm and 3cm on each side, asking students to find its area. Imagine the students will immediately use 6 × 3 similar to the rectangular area to calculate the area of parallelogram, and then use the number of grids to verify that the two sides are wrongly multiplied. To guide students to explore - then how to find a parallelogram