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Lt 1-21-7-14

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Thanh H?i Nguy?n
Thanh H?i Nguy?n
1 of 1
Ki?n th?c ¨C K? n?ng ¨C Kinh nghi?m Th?y H?i - S?t: 0988360070 Luy?n t?p 1 - 7/21/2014 - 1 - I. Gi?i ph??ng tr¨¬nh l??ng gi¨¢c 1. 1 cos 2 x ? ? 2. 25sin 4sin 1 0x x? ? ? 3. sin cos 2sin cos 1 0x x x x? ? ? ? 4. tan 3cot 4(sin 3cos )x x x x? ? ? 5. 38cos ( ) cos3 3 x x ? ? ? 6. 2sin ( ) 3sin3 1 2 0 2 x x ? ? ? ? ? ? II. Gi?i ph??ng tr¨¬nh m? 1. ? ? ? ?2 25 7 5 .35 7 .35 0x x x x 2. ? ? ?? ? ? 2 2 2 21 2 12 2 3 3x x x x 3. ? ? ?16 17.4 16 0x x 4. 3.4 (3 10).2 3 0x xx x? ? ? ? ? 5. ? ? ?8.3 3.2 24 6x x x 6. ?? ?112.3 3.15 -5 20x x x III. Kh?o s¨¢t c¨¢c h¨¤m s? sau: 1. 4 22 2y x x? ? ? 2. ? ? ? x y x 2 1 1 3. ? ?? ?2y x 2 x 1? ? ? IV. H¨¬nh h?c t?ng h?p 1. Cho l?ng tr? tam gi¨¢c ABC.A¡¯B¡¯C¡¯ c¨® ?¨¢y ABC l¨¤ tam gi¨¢c vu?ng t?i A, AB a? , 3AC a? , h¨¬nh chi?u vu?ng g¨®c c?a A¡¯ tr¨ºn m?t ph?ng (ABC) tr¨´ng v?i tr?ng t?m G c?a tam gi¨¢c ABC v¨¤ g¨®c gi?a AA¡¯ t?o v?i m?t ph?ng (ABC) b?ng 600 . T¨ªnh th? t¨ªch kh?i l?ng tr? ABC.A¡¯B¡¯C¡¯ v¨¤ kho?ng c¨¢ch t? B¡¯ ??n m?t ph?ng (A¡¯BC). 2. Cho h¨¬nh ch¨®p S.ABC c¨® ?¨¢y ABC l¨¤ tam gi¨¢c vu?ng c?n t?i A, BC=2a. H¨¬nh chi?u vu?ng g¨®c c?a ?i?m S l¨ºn m?t ph?ng (ABC) tr¨´ng v?i trung ?i?m BC, m?t ph?ng (SAC) t?o v?i ?¨¢y (ABC) m?t g¨®c 600 . T¨ªnh th? t¨ªch h¨¬nh ch¨®p v¨¤ kho?ng c¨¢ch t? ?i?m I ??n m?t ph?ng (SAC) theo a, v?i I l¨¤ trung ?i?m SB.

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Lt 1-21-7-14

  • 1. Ki?n th?c ¨C K? n?ng ¨C Kinh nghi?m Th?y H?i - S?t: 0988360070 Luy?n t?p 1 - 7/21/2014 - 1 - I. Gi?i ph??ng tr¨¬nh l??ng gi¨¢c 1. 1 cos 2 x ? ? 2. 25sin 4sin 1 0x x? ? ? 3. sin cos 2sin cos 1 0x x x x? ? ? ? 4. tan 3cot 4(sin 3cos )x x x x? ? ? 5. 38cos ( ) cos3 3 x x ? ? ? 6. 2sin ( ) 3sin3 1 2 0 2 x x ? ? ? ? ? ? II. Gi?i ph??ng tr¨¬nh m? 1. ? ? ? ?2 25 7 5 .35 7 .35 0x x x x 2. ? ? ?? ? ? 2 2 2 21 2 12 2 3 3x x x x 3. ? ? ?16 17.4 16 0x x 4. 3.4 (3 10).2 3 0x xx x? ? ? ? ? 5. ? ? ?8.3 3.2 24 6x x x 6. ?? ?112.3 3.15 -5 20x x x III. Kh?o s¨¢t c¨¢c h¨¤m s? sau: 1. 4 22 2y x x? ? ? 2. ? ? ? x y x 2 1 1 3. ? ?? ?2y x 2 x 1? ? ? IV. H¨¬nh h?c t?ng h?p 1. Cho l?ng tr? tam gi¨¢c ABC.A¡¯B¡¯C¡¯ c¨® ?¨¢y ABC l¨¤ tam gi¨¢c vu?ng t?i A, AB a? , 3AC a? , h¨¬nh chi?u vu?ng g¨®c c?a A¡¯ tr¨ºn m?t ph?ng (ABC) tr¨´ng v?i tr?ng t?m G c?a tam gi¨¢c ABC v¨¤ g¨®c gi?a AA¡¯ t?o v?i m?t ph?ng (ABC) b?ng 600 . T¨ªnh th? t¨ªch kh?i l?ng tr? ABC.A¡¯B¡¯C¡¯ v¨¤ kho?ng c¨¢ch t? B¡¯ ??n m?t ph?ng (A¡¯BC). 2. Cho h¨¬nh ch¨®p S.ABC c¨® ?¨¢y ABC l¨¤ tam gi¨¢c vu?ng c?n t?i A, BC=2a. H¨¬nh chi?u vu?ng g¨®c c?a ?i?m S l¨ºn m?t ph?ng (ABC) tr¨´ng v?i trung ?i?m BC, m?t ph?ng (SAC) t?o v?i ?¨¢y (ABC) m?t g¨®c 600 . T¨ªnh th? t¨ªch h¨¬nh ch¨®p v¨¤ kho?ng c¨¢ch t? ?i?m I ??n m?t ph?ng (SAC) theo a, v?i I l¨¤ trung ?i?m SB.