2019版高考数学二轮复习专题三三角2.3.2三角变换与解三角形专项练课件文.ppt

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1、3.2 三角变换与解三角形专项练,-2-,-3-,一、选择题,二、填空题,答案,解析,-4-,一、选择题,二、填空题,答案,解析,-5-,一、选择题,二、填空题,答案,解析,-6-,一、选择题,二、填空题,答案,解析,-7-,一、选择题,二、填空题,答案,解析,-8-,一、选择题,二、填空题,6.(2018山西吕梁一模,文4)ABC的内角A,B,C的对边分别为a,b,c,已知a= ,c=3,cos A= ,则b=( ) A.3 B.1 C.1或3 D.无解,答案,解析,-9-,一、选择题,二、填空题,答案,解析,-10-,一、选择题,二、填空题,答案,解析,-11-,一、选择题,二、填空题,9

2、在平面直角坐标系中,O为坐标原点,点P(1,3),Q(-1,1),则POQ外接圆的半径为( ),答案,解析,-12-,一、选择题,二、填空题,答案:D,-13-,一、选择题,二、填空题,-14-,一、选择题,二、填空题,-15-,一、选择题,二、填空题,答案,解析,-16-,一、选择题,二、填空题,答案,解析,-17-,一、选择题,二、填空题,答案,解析,-18-,一、选择题,二、填空题,14.(2018江苏卷,13)在ABC中,角A,B,C所对的边分别为a,b,c,ABC=120,ABC的平分线交AC于点D,且BD=1,则4a+c的最小值为 .,答案,解析,-19-,一、选择题,二、填空题,答案,解析,-20-,一、选择题,二、填空题,16.(2018浙江卷,13)在ABC中,角A,B,C所对的边分别为a,b,c.若a= ,b=2,A=60,则sin B= ,c= .,答案,解析,

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