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1.Cho A= x/x−4 + 1/ √x - 2 + 1/ √x + 2. Với x ≥ 0, x ≠ 4 a. Rút gọn A b. Tìm x để A > 1 2.Cho (P) y= 2x^2 và d : y= mx + n a. Tìm mn biết d qua A( 1,2 ) và d song song y = 4x + 1 b. Vẽ (P) c. Tìm giao điểm (P) và d 3. Cho tam giác ABC có 3 góc nhọn. 2 đường cao tam giác ABC là AD và BE cắt tại H. a. C/M CDHE nội tiếp đường tròn b. C/M HA. HD = HB.HE c. Gọi I là tâm đường tròn ngoại tiếp CDHE. Chứng minh IE là tiếp tuyến của đường tròn đường kính AB
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