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Mathematics, 22.07.2021 04:00 thevampsrock3

Cho (O;R) đường kính AB. gọi M, N lần lượt là trung điểm của OA, OB . qua M, N lần lượt vẽ các dây CD , EF song song với nhau (C và E nằm trên cùng 1 nửa đường tròn đường kính AB). Chứng minh tứ giác CDEF là hình chữ nhật

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Cho (O;R) đường kính AB. gọi M, N lần lượt là trung điểm của OA, OB . qua M, N lần lượt vẽ các dây C...
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