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26660029com:2018年必修三 同步练习:算法的基本结构及设计

同步练习:算法的基本结构及设计 一、选择题 1.算法作用之一是使计算机代替人完成某项工作.算法设计中有多种结构,常用有 种.( A.1 ) B.2 C.3 D.4 ) 2.算法结构可以优化程序设计,下列哪种算法不是程序的算法( A.顺序结构 C.循环结构 B.选择结构[来源:21 世纪教育网] D.四则运算 ) 3.变量的赋值是程序设计的重要基础.下列各式能作为赋值表达式的为( A.3:=x B.x:=3 C.x:=x2+1 ) D.x:=x+1 4.阅读下列流程图,说明输出结果( 开 始 a : = 1 输 出 b 结 束 b : = a + 3 A.1 B.3 C.4 D.2 5.阅读下列流程图,说明输出结果( 开 始 s: = 50 0 00 I:= 1 是 )21 世纪教育网 21 世纪教育网 I ≥ 4 否 s: = s- 50 00 I: = I + 1 A.50000 C.35000 输 出 s 结 束 B.40000 D.30000 1/6 二、填空题 6.算法流程有 、 、 三种控制结构. . 结 7.在设计求方程 ax+b=0 的解的算法中,应采取的控制结构为 8.从 1000 个已知数据中求出最大值.在设计控制流程图中,应采取 构. 9.根据如下流程图,请你计算当输入的 P=50,D=200 时,输出的结果 M= . 三、解答题 10.用语言和算法流程图描述求一元二次方程 ax2+bx+c=0 的根的情况. 11.设计算法输出 1000 以内被 5 和 7 整除的所有正数,并画出流程图. [来源:21 世纪教育网] 12.如下图所示是求某种运算的流程图,请你写出算法,并计算当 n=6 时,输出结果 C 的值. 开 始 输 入 n A : = 1, B := 1 , K : = 2 K < n 是 否 C := A+ B A : = B ,B : = C K:= K + 1 2/6 3/6 参考答案 一、选择题 1:C 2:C 3:D 4:C 5:C 二、填空题 6:顺序结构 条件结构 7:条件结构 8:循环 9:3800 三、解答题 10:用数学语言描述其算法: ①计算 Δ=b2-4ac. ②如果 Δ<0,则原方程无实数解. 否则(Δ≥0).计算: ? b ? b 2 ? 4ac ? b ? b 2 ? 4ac 2a 2a x1= ;x2= . 循环结构 ③输出解 x1、x2 或无实数解信息. 流程图: 开始 输入a、b、c 计算 := b 2 - 4 a c <0 否 是 x 1 := - b + 2a - x 2 := - b 2 a 输 出 x1 、 x2 输出无实数解 4/6 11:算法:①设 n:=1,a:=0. ②判断 a>1000 是否成立. A:如果 a>1000,结束循环;21 世纪教育网 B:如果否(a≤1000),执行③. ③赋值 a:=35n. ④赋值 n:=n+1. ⑤输出 a 的值. ⑥循环执行②. 流程图: 开 始 n : = 1, a : = 0 a > 1 00 0 否 是 a : = 35n 输 出 a 12:算法:①输入 n. n:= n+ 1 ②赋值 A=1,B=1,K=2. ③判断 K<n 是否成立.若否,终止流程输出 C;若是,继续执行. ④运算 C=A+B. ⑤赋值 A=B、B=C. ⑥赋值 K=K+1. ⑦执行③进行循环. 当 n=5 时,C=5. 5/6 结 束 6/6

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