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在今天的数学活动课上,徐老师说:“同学们,我们已经学习了很多平面图形的面积计算方法,但是有的图形不能直接求出它们的面积,我们必须借助其他条件找出中间量,寻找出解题的必要条件,才可以正确解答。”徐老师边说边在大屏幕上出示了这样一个图形(如下),并解释说:“ABCD是一个长方形,三角形ADE比三角形CEF的面积少10平方厘米,你能求出CF的长是多少厘米吗?”听完徐老师的题目,教室里鸦雀无声,大家都在积极思考,寻找解决问题的办法,
In today’s math class, Xu said: “Students, we have learned a lot about how to calculate the area of a flat graph, but some of the graphs can not find their area directly. We have to find out the middle amount with other conditions , To find out the necessary conditions to solve the problem before they can correct answer. ”Xu said while producing such a graphic on the big screen (below), and explained: “ ABCD is a rectangular, triangular ADE than triangular CEF Area less than 10 square centimeters, you can find the length of the CF is how many centimeters? ”After listening to the teacher’s topic, the classroom silent, everyone is actively thinking, looking for solutions to the problem,