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nguyenthithuhoa2006
2 năm trước
cho tam giác ABC ,trên AB lấy điểm M sao AM = 1/3 AB.Trên AC lấy N sao cho AN= 2/3 AC.Biết diện tích tam giác ABC là 90 cm vuông.Tính s tứ giác MNCB Giúp Mk, Mình cho hay nhất
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