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khanhhuyen43
2 năm trước
Cho tam giác ABC. Gọi M, N, P lần lượt trung điểm của AB, AC, BC. a) Hãy chỉ ra: vectơ cùng hướng với vectơ PN ; vectơ bằng vectơ PB. b) Dựng điểm E sao cho BC EA = . c) Dựng điểm F sao cho 1 . 2 AC FB
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