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Mathematics, 17.09.2021 14:10 brittanysanders

Cho hình thang ABCD (AB // CD), AB = 3cm; BC = 7cm. Gọi E, F lần lượt là trung điểm AC, BD. Chứng minh EF // CD và tính EF.

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Cho hình thang ABCD (AB // CD), AB = 3cm; BC = 7cm. Gọi E, F lần lượt là trung điểm AC, BD. Chứng...

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