• 2022-06-03
    What will be the value of ans after the following code has been executed?执行以下代码后,ans的值是什么?int x = 90,y = 55,ans = 10;if ( x == y);ans *= 2;
    A: 10
    B: 145
    C: 20
    D: No value, there is a syntax error 无值,语法错误
  • C

    内容

    • 0

      【单选题】在 MATLAB 命令窗口中 , 键入命令 syms x ; int(x*sin(x)) 。结果是 A. ans= sin(x)-x*cos(x) B. ans= cos(x)+x*sin(x) C. ans= sin(x)-cos(x) D. ans= -1/2*cos(x)*sin(x)+1/2*x

    • 1

      求微分方程[img=101x35]17da5f15503f795.png[/img] 的通解,实验命令为(). A: dsolve(Dy+2*x*y=x*exp(-x^2))ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 B: dsolve('Dy+2*x*y=x*exp(-x^2)','x')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 C: dsolve('Dy+2*x*y=x*exp(-x^2)')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2

    • 2

      计算 [img=61x41]17da60e4003aded.png[/img]实验命令为(). A: syms x; limit(tan(x)/(2*x))ans =1/2 B: syms x; limit(tanx/(2*x))ans =1/2 C: limit(tanx/(2*x),x,0)ans =1/2

    • 3

      17da52a3e27ca7e.png,计算极限的实验命令为(). A: syms a x; limit((a^x-1)/x)ans =log(a) B: limit((a^x-1)/x)ans=a C: syms x; limit((a^x-1)/x)ans =log(a)

    • 4

      命令format rat, 0.5输出的结果是() A: ans=0.5000 B: ans=1/2 C: ans=+ D: ans=0.50