2019年高考数学考纲解读与热点难点突破专题15算法、复数教学案文(含解析).doc

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1算法、复数【2019 年高考考纲解读】1.对于复数要掌握复数的概念、纯虚数、复数相等、复数的模、共轭复数等,以及复数的几何意义及四则运算(重点考查复数的乘除)2.对于程序框图要掌握基本算法语句尤其是含循环结构的程序框图,往往与分段函数的求值、数列求和或求积、统计等有规律的重复计算问题放在一起考查,读题审题要仔细【重点、难点剖析】一、复数的概念与运算1复数的乘法复数的乘法类似于多项式的四则运算,可将含有虚数单位 i 的看作一类项,不含 i 的看作另一类项,分别合并同类项即可 【变式探究】执行如图所示的程序框图,运行相应的程序 ,若输出的结果是 4,则常数 a 的值为( )A4 B2 C D112【解析】 S 和 n 依次循环的结果如下: S , n2; S1 , n4.所以 1 2, a1.故选 D11 a 1a 1a【 答案】D【变式探究】若某程序框图如图所示,则该程序运行后输出的 i 的值为( )2A4 B5 C6 D7【解析】根据程序框图,程序执行中的数据变化如下:n12, i1; n6, i2;65; n3, i3;35; n10, i4;105; n5, i5;55 成立,程序结束,输出 i5.故选 B 【答案】B3

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