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phuchuuhuynh203
2 năm trước
Điểm I là trung điểm cạnh đáy NP của tam giác can MNP . Các điểm E và F thay đổi thứ tự thuộc các cạnh MN, MP sao cho góc PIF = NEI. Chứng minh rằng: a. NE, PE = NI^2 b. Tam giác NIE ~ tam giác IFE c. Hạ IQ vuông góc với EF. CM: IQ ko đổi giúp mik vsssss
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