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hadgaming
2 năm trước
vẽ 3 điểm A,B,C (ko thẳng hàng). Qua A vẽ đường thẳng d1 và d2 sao cho d1 ⊥ BC và d2 // BC. Có kết luận về đường thẳng d1 và d2? Giải thích ?
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