数学试题答案
2023—2024年度高二年级下学期期末考试模拟卷数学参考答案1.D ∵A={x|0≤x≤2},∴∁UA={x|x<0或x>2}.∵B={x|x>0},∴(∁UA)∩B={x|x>2}.2.B (i-1)21+i=-2i1+i=-2i(1-i)2=-1-i.3.B 因为a2=4,b2=9,所以a=2,b=3,所以该双曲线的渐近线方程为y=±23x,即2x±3y=0.4.C 因为S2=3a2,所以a1=2a2,所以公比q=12,所以S3a3=a1(1-q3)1-qa1q2=1-q3q2(1-q)=7.5.D f'(x)=ax-1=a-xx(x>0),令f'(x)>0,可得0
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