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一道习题常常有多种解法。一题多解可使学生从多角度,多层次,全方位研究和思考问题,并通过比较寻找解决问题最佳途径和方法。这对开阔学生思路,培养科学的思维方法,提高分析和解决问题的能力,都很有助益。 例1.一个人站在地面上用枪对准树上的猴子(如图1)。设子弹从枪上射出时(具有足够大的初速度),猴子立即从树上竖直下落(初速度为零ν_0)。讨论一下,猴子能否避开子弹的射击。
There are often many solutions to a problem. A multi-solution allows students to study and think about problems from multiple perspectives and levels, and find the best ways and means to solve problems through comparison. This is helpful to broaden the students’ thinking, develop scientific thinking methods, and improve the ability to analyze and solve problems. Example 1. A person stands on the ground and shoots a monkey at a tree with a gun (Figure 1). When the bullet was fired from the gun (with a sufficiently large initial velocity), the monkey immediately dropped from the tree (the initial velocity was zero ν_0). Discuss whether the monkey can avoid the shooting of bullets.