有定义语句：int a=1,b=2,c=3,x;，则以下选项中各程序段执行后，x的值不等于3的是________。 A: if(c<a)x=1; else if(b<a) x=2; else x=3; B: if(a<3)x=3; else if (a<2) x=2; else x=1; C: if(a<3) x=3; if(a<2) x=2; if(a<1) x=1; D: D）if (a<b) x=b; if(b<c) x=c; if(c<a) x=a;

1. 当int x,a=1,b=3,c=5,d=4;时，执行下面一段程序后，x的值为（ ）。 if(a<b) if(c<d)x=1; else if(a<c) if(b<d)x=2； else x=3; else x=6; else x=7; A. 1 B. 2 C. 3 D. 6 A: 1 B: 2 C: 3 D: 6

以4，9，1为为插值节点，求\(\sqrt x \)的lagrange的插值多项式 A: \( {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) B: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) + {1 \over {24}}(x - 4)(x - 9)\) C: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x +1) + {1 \over {24}}(x - 4)(x - 9)\) D: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) - {1 \over {24}}(x - 4)(x - 9)\)

下面代码的输出是什么？ x = 0 while x < 4: x = x + 1 print("x is", x)‎​‎ A: x is 0 B: x is 1 C: x is 2 D: x is 3 E: x is 4

运行如下程序段： x=1 y=1 z=1 For j=1 To 3 For k=1 To 3 If j=1 Then x=x+y+z Else If j=2 Then x=2*x+2*y+2*z Else x=3*x+3*y+3*z End If Next k Next j x的值应是______。