x = 13,y=-13,执行语句x,y=y,x后，变量x的值为（ ） A: 13 B: 0 C: -13 D: 出错

X～N(10，22)，求P(10＜X＜13)，P(X＞13)，P(|X-10|＜2)．

x = 13,y=-13,执行语句x,y=y,x后，变量x的值为（ ）

不等式x+12x+1−|x|≥1的解集为(−13，+∞)(−13，+∞)．

【多选题】13 13 13 13 A. 13 13 B. 13 13 C. 13 13 D. 13 13

已知线性卷积x(n)*h(n)={-15, 4, -3, 13, -4, 3, 2}。x(n)和h(n)的6点圆周卷积和x(n)⑥h(n)为（ ）。 A: {-13, 4, -3, 13, -4, 3} B: {-15, 4, -3, 13, -4, 3, 2} C: {-15, 4, -3, 13, -4, 3} D: {-15, 4, -3, 13, -4, 3, 2}

【单选题】13 13 13 13 A. 13 B. 13 C. 13 D. 13

设函数f（x）=4x+2x2-1-3x-1(x＞1)2x3ax2+3(x≤1)在点x=1处连续，则a等于（　　） A: -12 B: 12 C: -13 D: 13

执行以下程序后，输出结果为 #include&#91;stdio.h&#93; void main() { int x; float y; y=3.6; x=(int)y+10; cout<<"x="<<x<<"y="<<y; } A: x=13,y=3.600000 B: x=13.5,y=3.60000 C: x=13,y=3 D: x=13,y=3.6

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