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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: Bài 5: Cho Q = (1/√????−1−1/√????):(√????+1/√????−2−√????+2/√????−1) ( ????>0;????≠4;????≠1) a)Rút gọn b)Tính Q khi a = 9 c)Tìm a để Q dương. { "@context": "https://schema.org", ...

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