CHO TAM GIÁC ABC CÓ TRUNG TUYẾN AM ,GỌI I LÀ TRUNG ĐIỂM AM .ĐẲNG THỨCN...

câu 44: - BAI TAP TRAC NGHIEM HINH HOC 10 CHUONG 1

BAI TAP TRAC NGHIEM HINH HOC 10 CHUONG 1

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Câu 44: Cho tam giác ^ABC có trung tuyến AM ,gọi I là trung điểm AM .Đẳng thức

nào sau đây đúng?

A. ² ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^{IA IB IC} ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ⁰ . B. ^ ^ ^ ^ ^ ^ ^ ^ ^ ^{IA IB IC} ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ⁰ .

C. ² ^ ^ ^ ^ ^ ^ ^ ^{IA IB IC} ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ⁴ ^IA . D. ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^{IB IC} ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^IA .

MA MB MC