CHO HÌNH BÌNH HÀNH ABCD. ĐẲNG THỨC NÀO SAU ĐÂY ĐÚNG

câu 11. - Đề giữa học kì 1 Toán 10 năm 2021 - 2022 trường THPT Hồ Nghinh - Quảng Nam -

Lớp 10 Toán Đề giữa học kì 1 Toán 10 năm 2021 - 2022 trường THPT Hồ Nghinh - Quảng Nam -

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Câu 11. Cho hình bình hành ABCD. Đẳng thức nào sau đây đúng ?

A. ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^{AB AD CA} ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ . B. ^ ^ ^ ^ ^ ^ ^ ^ BA BD ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^  ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^  ^BC .

C. ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^{AB AD} ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^AC . D. ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ AB AC ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^  ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^  ^AD .