以下代码的输出结果是def fun(num):num *= 2print(num)x = 20fun(x)print(x) A: 20 20 B: 10 10 C: 20 40 D: 40 20

【单选题】#include <stdio.h> int x1 = 30, x2 = 40; void sub(int x, int y) { x1 = x; x = y; y = x1; } int main() { int x3 = 10, x4 = 20; sub(x3, x4); sub(x2, x1); printf(" %d, %d, %d, %d ", x3, x4, x1, x2); return 0; } A. 10, 20, 40, 40 B. 10,40, 40, 40 C. 20, 20, 40, 40 D. 10, 10, 40, 40

有一随机变量x~N(30, 25)，若P(x<20)＝0.0227，则P(x≥40)=

以下代码的输出结果是（_____）。def fun(num): num *= 2 x = 20 fun(x) print(x) A: 40 B: 10 C: 20 D: 报错

You are offered an investment opportunity. Its outcomes and probabilities are presented in the following table. X P(X) –$1000 .40 $0 .20 +$1000 .40 The mean of this distribution is _____________.

‍以下程序的输出结果是：（）‌‍def func(num):‌‍ num *= 2‌‍x = 20‌‍func(x)‌‍print(x)‌‍‌ A: 40 B: 出错 C: 无输出 D: 20

下面程序的运行结果是( )。 def func(num): num *= 2 x = 20 func(x) print(x) A: 40 B: 20 C: 出错 D: 无输出

You are offered an investment opportunity. Its outcomes and probabilities are presented in the following table. X P(X) –$1000 .40 $0 .20 +$1000 .40 Which of the following statements is true?

能正确表示“当x的取值在[-58,-40]和[40,58]范围内为真,否则为假”的表达式是: (x>= -58) && (x<= -40) && (x>=40) && (x<=58)|(x>= -58) && (x<= -40) || (x>=40) && (x<=58)|(x>= -58) | |(x<= -40) && (x>=40) || (x<=58)|(x>= -58) || (x<= -40) || (x>=40) || (x<=58)

‌已知程序如下，若X=10, Y=20, Z=30，该程序执行完成后，X的值为_____。​‌X = Z + Y； If Y &#91; Z { X = X – Y； } Else{ X= X – Z； } X = X – Y； If X < Z { X = Y +20； } X = X – Z； If X &#93; Y { X = X – Y； }​ A: 10 B: 20 C: 30 D: 40