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一、利用相似三角形对应边成比例的性质求函数解析式。例1 如图1,Rt△ABC中,∠BAC=Rt∠,AB=AC
First, use the nature of similar sides of a similar triangle to evaluate the function analytical formula. Example 1 In Figure 1, Rt △ ABC, ∠ BAC = Rt ∠, AB = AC