LINGO程序中, 对下列表达式程序编写正确的是[img=229x30]18034d60a8de840.png[/img]
A: 98x1+277x2-x1^2-0.3x1x2-2x2^2
B: 98*x1+277*x2-x1^2-0.3*x1*x2-2*x2^2
C: 98*x1+277*x2-x1**2-0.3*x1*x2-2*x2**2
D: 98*x1+277*x2-x1^2-0.3*x1x2-2*x2^2
A: 98x1+277x2-x1^2-0.3x1x2-2x2^2
B: 98*x1+277*x2-x1^2-0.3*x1*x2-2*x2^2
C: 98*x1+277*x2-x1**2-0.3*x1*x2-2*x2**2
D: 98*x1+277*x2-x1^2-0.3*x1x2-2*x2^2
举一反三
- LINGO程序中, 对下列表达式程序编写正确的是[img=229x30]18034d61706c78d.png[/img] A: 98x1+277x2-x1^2-0.3x1x2-2x2^2 B: 98*x1+277*x2-x1^2-0.3*x1*x2-2*x2^2 C: 98*x1+277*x2-x1**2-0.3*x1*x2-2*x2**2 D: 98*x1+277*x2-x1**2-0.3*x1*x2-2*x2**2
- 求函数[img=148x49]17da6537a5eee98.png[/img]的导数; ( ) A: 1/(x^2*(2/x^2 + 1)) B: -1/(x^2*(2/x^2 + 1)) C: (x^2*(2/x^2 + 1)) D: -1/(x^2*(2/x^2 + 1))+2/x^2 + 1
- 求函数 f(x)=3*x1^2 + 2*x1*x2 + x2^2 − 4*x1 + 5*x2. 时,输入代码 >>fun = @(x)3*x(1)^2 + 2*x(1)*x(2) + x(2)^2 - 4*x(1) + 5*x(2); >>x0 = [1,1]; >>[x,fval] = fminunc(fun,x0); 其中fun的作用是:
- 积分[img=136x52]1803d6afd4e6f95.png[/img]的计算程序和结果是 A: clearsyms xy=1/x^2/sqrt(x^2-1)int(y,x,-2,-1)3^(1/2)/2 B: clearsyms xint(1/x^2/sqrt(x^2-1),x,-2,-1)3^(1/2)/2 C: clearsyms xint(1/x/sqrt(x^2-1),x,-2,-1)-pi/3 D: clearsyms xint(1/x/sqrt(x^2-1),x,-2,-1)3^(1/2)/2 E: clearsyms xint(1/x^2*sqrt(x^2-1),x,-2,-1)log(3^(1/2) + 2) - 3^(1/2)/2
- 【单选题】对任意实数x 1 , y 1 , x 2 , y 2 , x 1 < x 2 , y 1 < y 2 , 分布函数P{x 1 <X≤x 2 , y 1 <Y≤y 2 }=? A. F(x 2 , y 2 )+ F(x 1 , y 1 )+ F(x 1 , y 2 )+ F(x 2 , y 1 ) B. F(x 2 , y 2 )- F(x 1 , y 1 )+ F(x 1 , y 2 )- F(x 2 , y 1 ) C. F(x 2 , y 2 )+ F(x 1 , y 1 )- F(x 1 , y 2 )- F(x 2 , y 1 ) D. F(x 2 , y 2 )- F(x 1 , y 1 )- F(x 1 , y 2 )+ F(x 2 , y 1 )