24.05.2019 Views

Tuyển chọn các dạng toán hay lạ khó - Chu Văn Biên (Phần I-IV)

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Vì P<br />

n<br />

P<br />

_<br />

nên U '.0,1I UI 1 nUI U ' 10 9,9nU<br />

100<br />

' tieu _ thu tieu thu<br />

Chọn D.

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