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sieusaiyan25
2 năm trước
cho ΔABC vuông tại A đường trung tuyến AM . Kẻ MH ⊥ AB ( H ∈ AB ) , MK ⊥ AC ( K ∈ AC ) a) cm AHMK là hình chữ nhật b)E là trung điểm của MH . cm ba điểm B,E,K thẳng hàng c)F là trung điểm của MK . Đường thẳng HK cắt AE tại I cắt AF tại J cm IH=HK
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