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Bộ 23 đề thi thử THPTQG năm 2018 - Môn Toán - Gv Đặng Việt Đông - Lovebook - Có lời giải chi tiết

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h h <br />

2<br />

1 2 1 2 8 8 + + R−<br />

h<br />

h h<br />

64<br />

2 ( 2 ) ( 2 )<br />

2 2 R<br />

V = a h = h R − h = R − h <br />

=<br />

3 3 3 2 2 3 3 81<br />

<br />

<br />

Vậy GTLN của V bằng<br />

4R<br />

Suy ra a = .<br />

3<br />

64<br />

81<br />

3<br />

R h<br />

4<br />

đạt được khi<br />

R<br />

= 2R − h h =<br />

2 3<br />

3<br />

3

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