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题1 如图1,已知△ABC的内切圆I切BC边干点D,而P是BC边上的任意内点,三角形ABP和ACP的内切圆圆心分别是I_1和I_2.
Question 1 As shown in Figure 1, the inscribed circle of △ABC is known as the dry point D of the BC edge, and P is an arbitrary point on the BC side. The inscribed circle centers of the triangle ABP and the ACP are I_1 and I_2, respectively.