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BỘ ĐỀ THI THỬ THPTQG NĂM 2018 - MÔN TOÁN - TRẦN MINH TIẾN (ĐỀ 1-8) - CÓ LỜI GIẢI CHI TIẾT

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V V 2SH V SH<br />

<br />

V SC V SC<br />

2<br />

nên<br />

S.AHD S.AHB S.ABHD<br />

Có BC SAM<br />

nên <br />

0 3a<br />

<br />

SBC ; ABCD SMA 60 SA 2<br />

Mặt khác:<br />

CH CO a<br />

CAS CHO CH <br />

CA SA 13<br />

SH SC HC HC 11 11<br />

Suy ra 1 VS.ABHD<br />

V<br />

SC SC SC 13 13<br />

11 2<br />

Do đó VH.BCD V VS.ABHD<br />

V V V.<br />

12 13<br />

28

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