CHO HÌNH BÌNH HÀNH ABCD VÀ ĐIỂM M TÙY Ý. ĐẲNG THỨC NÀO SAU ĐÂY...

câu 21. - BAI TAP TRAC NGHIEM HINH HOC 10 CHUONG 1

BAI TAP TRAC NGHIEM HINH HOC 10 CHUONG 1

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Câu 21. Cho hình bình hành ABCD và điểm M tùy ý. Đẳng thức nào sau đây

đúng ?

A. ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^{MA MB} ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^MC ^ ^MD . B. ^ ^{MA MD} ^ ^ ^ ^ ^ ^MC ^ ^MB .

C. ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^AM ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^MB ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^CM ^ ^MD . D. ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^{MA MC} ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^MB ^ ^MD .