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昨天的数学课上,我们一起研究了平方差公式．通过计算(a+b)(a-b)=a2-b2,符老师向我们提出了一个问题:怎样利用两种不等长的线段a、b构造一个模型,以此来证明平方差公式?全班同学都陷入了深深的思考。
In yesterday’s math class, we studied the squared difference formula together. By calculating (a+b)(ab)=a2-b2, Fu teacher asked us a question: How to construct a model by using two unequal line segments a and b to prove the square difference formula? Classmates are in deep thought.