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数学试题 一、选择题(本大题共12小题,每小题5分,共60分) .1.函数,’(_):苎!堕垒的最小正周期是( ) ‘ COS工、 (A)号 (B)丌 ((?)2丌(D)4n 2.圆(z..1)。+,。==-==1的圆心到直线y=等z的距离是( ) (A){ (B)等 (c)l (D)朽 3.不等式(1+.r)(I一1 z J)0的解集是( ) (A){j|l 0≤.r:l
Mathematical questions 1, multiple-choice questions (the title of a total of 12 small questions, each question 5 points, a total of 60 points) .1. function, ’(_): 苎! 堕 the base of the minimum positive cycle is () ’COS workers, (A) (B) 丌 ((?) 2 丌 (D) 4n 2. Circle (z.. 1). +, . ==-==1 The distance from the center of the circle to the straight line y = equal z is () (A) { (B) etc. (c)l (D) 33. The solution set of inequality (1+.r) (I- 1z J)0 is () (A){j|l 0≤.r :l