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有些应用题,条件错综复杂,很难找到解题突破口。要是能根据题意画一画图示,不但可以巧妙地解答难题,掌握解题方法,还能提高思维能力,感受学习数学的乐趣。例如:三年一班有48人,其中学习陶艺的有32人,学习彩绘的有38人,两种技艺都学的有25人。那么:1.只学习陶艺而没有学习彩绘的有多少人?2.只学习彩绘而没有学习陶艺的有多少人?
Some application questions, the conditions are complicated, it is difficult to find a solution to the problem. If you can draw a picture based on the inscription, not only can cleverly answer the problem, master the problem-solving method, but also improve thinking ability, feel the fun of learning mathematics. For example: There are 48 people in three years, of which 32 people learn pottery, 38 people learn painting, and 25 people learn both skills. Then: 1. How many people are learning pottery without studying painting? 2. How many people are learning to paint without learning pottery?