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duonghien141205
2 năm trước
cho hình thang ABCD( AB// CD) có hai đường chéo AC và BD cắt nhau tại O trên OD,OC lần lượt lấy các điểm M,N sao cho OD=3cm OC=3ON.chứng minh rằng MN//AB; cho biết AB=4cm CD= 6cm. Tính độ dài đoạn thẳng MN và tỉ số OA/ON. mình đang cần gấp nhé mọi người
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