Sở GD & ĐT Hà Nội Họ & tên.. Trường THPT Quốc Oai Lóp.. ---***--- Kiểm tra 45’ Điểm Lời thầy cô phê Đề : 1. Cho hình bình hành ABCD tâm O. I là trung điểm OC. Biểu biễn các vectơ và BI IG theo a và b , với ; a DA b DB . ( G là trọng tâm tam giác OBC ). 2. Cho tam giác ABC, lấy các điểm M, N, P sao cho 3MB MC ; 3 0NA NC ; 0PA PB . a) Tính ;MP MN theo các vectơ &AB AC b) Chứng minh M, N, P thẳng hàng. Bài làm ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... ...................................................................................................................................................... Đáp án 1. 1 1 2 4 1 1 6 12 BI a b IG a b 2. a. 3 1 3; ; 4 2 2 AN AC AP AB BM BC 3 2 MP AB AC ; 1 3 2 4 MN AB AC b. 2MP MN M, N, P thẳng hang.
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