宁波三锋教研联盟2024学年高二第一学期期中联考物理试题及答案

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19解:(1)由a2+a12=30及S8=80,a1+d+11d=30,8×78a1+2即/Q1+6d(3分)2a1+7d=20,解得/(=3,所以an=2n+1(5分)(2)由(1)得W+1)(2n+3)=2(2n+12n+3)(6分)所以Tn=b1+b2+…+b=2[(3-5)++(2n+12n+3)=2(3-2n+33(2n+(9分)+所以Tn+3(2n+5)(10分)所以Tn-1T3(2n+53(2n+3(2n+5)(2n+3)所以{Tn}为递增数列所以Tn≥T1=1又T所以T,∈(12分)

7.D【解析】因为能被5整除的数,其个位必为0或5,所以分两类第一类:个位为0的,有A3=60个;第二类:个位为5的,有AA=48个,所以在由数字0,1,2,34.5组成的没有重复数字的四位数中,能被5整除的有660+48=108个.故选D