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Các dạng bài tập hay lạ khó chương DAO ĐỘNG CƠ HỌC có lời giải chi tiết

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Ch n C.<br />

<strong>Các</strong>h 2: Gi s khi g p nhau l c m t góc c m t góc .<br />

ó:<br />

D ng giác Ch n C.<br />

Câu 66.<br />

ng các v t:<br />

Kho ng th i gian trong m là:<br />

Kho ng th i gian trong m là:<br />

Vì<br />

nên<br />

Ch n A.<br />

Câu 67.

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