若有宏定义：#define s(x) x*x，则表达式s(2+1)的值为 A: 9 B: 4 C: 5 D: 6

vivo X9s支持QQ自动计步吗？

如下程序运行后输出的结果是 x=0 For k=3 To 5 x=x+2 s=s+x Next k Print s A: 3 B: 12 C: 6 D: 9

Ike's utility function is U(x;y) = 25xy. He has 12 units of good x and 8 units of y. Ben's utility function for the same two goods is U(x;y)=4x+4y. Ben has 9 units of x and 13 units of y.

表示x是5的倍数或是9的倍数的逻辑表达式为 ____。 A: x \ 5 = 0 Or x \ 9 = 0 B: x \ 5 = 0 And x \ 9 = 0 C: x Mod 5 = 0 Or x Mod 9 = 0 D: x Mod 5 = 0 And x Mod 9 = 0

以下赋值语句正确的是 ______。 A: STORE8TOX,Y B: STORE 8,9TOX,Y C: X=S,Y=9 D: X,Y=8

int x，y; x=9%5; y=9/5 则x=,y=。

所有北大学生(S(x))都是聪明的(P(x))”谓词公式是 A: $x(S(x)∧P(x)) B: "x(S（x）→P(x)) C: $x(S(x)∧﹁P(x)) D: "x(S(x)→﹁P(x))

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: \( - {2 \over {15}}(x - 9)(x - 1) + {3 \over {40}}(x - 4)(x - 1) - {1 \over {24}}(x - 4)(x - 9)\)

X9s前置像素是:() A: 2000W+500W B: 2000W+800W C: 2000W+1600W D: 2000W+2000W