2019年高考数学二轮复习专题突破课时作业20算法初步、复数、推理与证明理.doc

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1课时作业 20 算法初步、复数、推理与证明12018全国卷(1 i)(2 i)( )A3 i B3 iC3 i D3 i解析:(1 i)(2 i)22 i i i23 i.故选 D.答案: D22018浙江卷复数 (i 为虚数单位)的共轭复数是( )21 iA1 i B1 iC1 i D1 i解析: 1 i,21 i 2 1 i1 i2 2 1 i2 共轭复数为 1 i.故选 B.答案: B32018唐山市高三五校联考摸底考试执行如图所示的程序框图,当输入的 n 为 7时,输出的 S 的值是( )A14 B210C42 D840解析:n7,S1,71 000 的最小偶数n,那么在 和 两个空白框中,可以分别填入( )A A1 000 和 n n1B A1 000 和 n n2C A1 000 和 n n1D A1 000 和 n n2解析:因为题目要求的是“满足 3n2 n1 000 的最小偶数 n”,所以 n 的叠加值为2,所以 内填入“ n n2” 由程序框图知,当 内的条件不满足时,输出 n,所以 内填入“ A1 000” 故选 D.答案:D

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