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数一数,右图中共有多少个长方形:10个?18个?都不对,正确答案是:共有45个长方形。用怎样的方法才能既简捷又准确地数出长方形的个数呢?先来看一段:这其中有多少条线段呢?若我们把一个最小段看作
The number of the right, the total number of rectangles on the right: 10? 18? Not right, the correct answer is: a total of 45 rectangles. How can we use it to count the number of rectangles simply and accurately? Let's look at the first paragraph: How many lines do we have? If we consider a minimum segment as