2007-2018全国卷---选做题分类汇编（李欣老师） (1).pdf
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绗竷绔犳瀬鍧愭爣涓庡弬鏁版柟绋
1. 锛?018 鍏ㄥ浗I 锛夊湪鐩磋鍧愭爣绯粁Oy 涓紝鏇茬嚎C 鐨勬柟绋嬩负 y = k x + 2锛庝互鍧愭爣鍘熺偣涓烘瀬 1 鈭 鈭 鐐癸紝x 杞存鍗婅酱涓烘瀬杞村缓绔嬫瀬鍧愭爣绯伙紝鏇茬嚎C2 鐨勬瀬鍧愭爣鏂圭▼涓 蟻2 + 2蟻cos胃 鈭 3 = 0锛
2. 锛?018 鍏ㄥ浗II 锛夊湪鐩磋鍧愭爣绯 xOy 涓紝鏇茬嚎 C 鐨勫弬鏁版柟绋嬩负 {x = 2cos胃,锛埼 涓哄弬鏁帮級锛 y = 4sin胃 鐩寸嚎 l 鐨勫弬鏁版柟绋嬩负 {x = 1 + tcos伪, 锛坱 涓哄弬鏁帮級锛 y = 2 + tsin伪 锛?锛夋眰 C 鍜 l 鐨勭洿瑙掑潗鏍囨柟绋嬶紱 ( ) 锛? 锛夎嫢鏇茬嚎 C 鎴洿绾 l 鎵€寰楃嚎娈电殑涓偣鍧愭爣涓 1,2 锛屾眰 l 鐨勬枩鐜囷紟
3. 锛?017 鍏ㄥ浗I 锛夊湪鐩磋鍧愭爣绯 肀ロ眰肀 涓紝鏇茬嚎 戆 鐨勫弬鏁版柟绋嬩负 {肀 = 3cos饊寖, 锛堭€寖 涓哄弬鏁帮級锛 肀 = sin饊寖 鐩寸嚎 肀 鐨勫弬鏁版柟绋嬩负 {肀 = 肀 + 4饊仭, 锛堭€仭 涓哄弬鏁帮級锛 肀 = 1 鈭 饊仭 锛?锛夎嫢 肀 = 鈭?锛屾眰 戆 涓 肀 鐨勪氦鐐瑰潗鏍囷紱 锛? 锛夎嫢 戆 涓婄殑鐐瑰埌 肀 鐨勮窛绂荤殑鏈€澶у€间负 17锛屾眰 肀 锛 鈭
4. 锛?017 鍏ㄥ浗II 锛 鍦ㄧ洿瑙掑潗鏍囩郴 肀ロ眰肀 涓紝浠ュ潗鏍囧師鐐逛负鏋佺偣锛岉饱 杞寸殑姝ｅ崐杞翠负鏋佽酱寤 绔嬫瀬鍧愭爣绯伙紝鏇茬嚎 戆? 鐨勬瀬鍧愭爣鏂圭▼涓 饊寣cos饊寖 = 4 锛 锛?锛夗眬 涓烘洸绾 戆 涓婄殑鍔ㄧ偣锛岀偣 肀 鍦ㄧ嚎娈 肀傢眬 涓婏紝涓旀弧瓒 肀傢眬 鈰 肀傢眱 = 16锛屾眰鐐 1 鈭 鈭 鈭 鈭 肀 鐨勮建杩 戆? 鐨勭洿瑙掑潗鏍囨柟绋嬶紱 锛? 锛夎鐐 戆 鐨勬