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一、选择题(本大题共12小题,每小题5分,共60分.在每小题给出的四个选项中,只有一项是符合题目要求的) 1.已知4个实数-9,a1,a2,-1成等差数列,5个实数-9,b1,b2,b3,-1成等比数列,则b2(a2-a1)等于(A)-8.(B)8.(C)-9/8.(D)9/8。2.已知数列{an},那么“对任意n∈N,点Pn(n,an)都在直线r=2x+1上”是“{an}为等差数列”的
First, the multiple-choice questions (the title of a total of 12 small questions, each question 5 points, a total of 60 points. Among the four options given in each question, only one is in line with the requirements of the title) 1. known 4 Real numbers -9, a1, a2, -1 are equal arithmetic series, 5 real numbers -9, b1, b2, b3, -1 are equal number sequences, then b2(a2 - a1) is equal to (A) - 8.(B ) 8.(C)-9/8.(D)9/8. 2. Known series {an}, then “For any n∈N, point Pn(n,an) is on the straight line r=2x+1 “” is “{an} is an arithmetic progression”