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kimngocngan.0405
2 năm trước
: Cho tam giác ABC nhọn có E,F lần lượt là trung điểm AB,AC. a/ Chứng minh BC = 2.EF b/ Gọi M là trung điểm BC. AM cắt AF tại I. Chứng minh IA=IM c/ Đường thẳng CI lần lượt cắt AB tại Q, cắt FM tại S. Chứng minh S là trung điểm của CQ d/* QM cắt BS tại N.Đường thẳng qua S song song BC và cắt AB tại T. Chứng minh C,N,T thẳng hàng. giải tui câu c vs b vs nhanh giúp tui nha tui đang gấp
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