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		<h1>Đề thi thử vào lớp 10 năm 2017 - Thầy Nguyễn Cao Cường &#40;Có Video chữa&#41;</h1>
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			Đề thi thử vào lớp 10 năm 2017 đề số 1 do Thầy Nguyễn Cao Cường ra và có video chữa rất chi tiết. Thầy Nguyễn Cao Cường giáo viên nổi tiếng trên kểnh vtv2, tư vấn cho các báo Vnexpress, Baomoi, infonet...
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			<p align="center"><strong>ĐỀ ÔN THI VÀO LỚP 10 THPT - MÔN TOÁN -&nbsp; ĐỀ SỐ 01 - 2017</strong></p>

<p align="center"><strong><u>&nbsp;</u></strong>Môn thi:&nbsp;<strong>TOÁN</strong></p>

<p align="center">Thời gian làm bài:&nbsp;<em>120 phút</em></p>

<div style="text-align:center"><img alt="untitled 1" height="1058" src="https://thcstranquangkhai.edu.vn/uploads/tai-nguyen/2017_04/untitled_1.png" width="744" /></div>

<p><strong>Bài IV</strong>&nbsp;<em>(3,5 điểm)</em>&nbsp; Cho (O;R) đường kính AB cố định. Dây CD di động vuông góc với AB tại H nằm giữa A và O. Lấy điểm F thuộc cung AC nhỏ. BF cắt CD tại E; AF cắt tia DC tại I.</p>

<p>a) Chứng minh rằng tứ giác AHEF là tứ giác nội tiếp.</p>

<p>b) Chứng minh rằng: HA. HB = HE. HI</p>

<p>c) Đường tròn ngoại tiếp tam giác IEF cắt AE tại M. Chứng minh rằng: M thuộc (O;R)</p>

<p>d) Tìm vị trí của H trên OA để tam giác OHD có chu vi lớn nhất.</p>

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