intx=5,y=8,z=7;表达式z=!(x>y)||(x=1,y=3)计算后的结果 A: x=1,y=3,z=1 B: x=1,y=3,z=0 C: x=5,y=8,z=0 D: x=5,y=8,z=1
intx=5,y=8,z=7;表达式z=!(x>y)||(x=1,y=3)计算后的结果 A: x=1,y=3,z=1 B: x=1,y=3,z=0 C: x=5,y=8,z=0 D: x=5,y=8,z=1
设X~U(a, b), E(X)=3, D(X)=1/3, P{2<X< 3} = ( ). A: 0 B: 1/4 C: 1/3 D: 1/2
设X~U(a, b), E(X)=3, D(X)=1/3, P{2<X< 3} = ( ). A: 0 B: 1/4 C: 1/3 D: 1/2
【单选题】rev(c(1,3,2,6,7,8,8,1,1,0))的运行结果 ? A. [1] 0 1 1 1 2 3 6 7 8 8 B. [1] 1 3 2 6 7 8 8 1 1 0 C. [1] 0 1 1 8 8 7 6 2 3 1 D. [1] 8 8 7 6 3 2 1 1 1 0
【单选题】rev(c(1,3,2,6,7,8,8,1,1,0))的运行结果 ? A. [1] 0 1 1 1 2 3 6 7 8 8 B. [1] 1 3 2 6 7 8 8 1 1 0 C. [1] 0 1 1 8 8 7 6 2 3 1 D. [1] 8 8 7 6 3 2 1 1 1 0
已知X的分布律为P(X=-1)=1/4,P(X=0)=1/4,P(X=1)=3/8,P(X=3)=1/8,则E(2X+1)=( ),E([img=42x20]17e0c5d65688ad3.jpg[/img])=( )。
已知X的分布律为P(X=-1)=1/4,P(X=0)=1/4,P(X=1)=3/8,P(X=3)=1/8,则E(2X+1)=( ),E([img=42x20]17e0c5d65688ad3.jpg[/img])=( )。
已知随机变量X~U(0,2),则P(X>1)=, 已知随机变量Y~E(1),则P(Y=1)=, 已知随机变量Z~N(0,2?),则P(Z=0)=,P(Z≥0)=
已知随机变量X~U(0,2),则P(X>1)=, 已知随机变量Y~E(1),则P(Y=1)=, 已知随机变量Z~N(0,2?),则P(Z=0)=,P(Z≥0)=
调用下面函数,错误的是( )。def f(x, y = 0, z = 0): pass #空语句,定义空函数体 A: f(z = 3, x = 1, y = 2) B: f(1, x = 1, z = 3) C: f(1, y = 2, z = 3) D: f(1, z = 3)
调用下面函数,错误的是( )。def f(x, y = 0, z = 0): pass #空语句,定义空函数体 A: f(z = 3, x = 1, y = 2) B: f(1, x = 1, z = 3) C: f(1, y = 2, z = 3) D: f(1, z = 3)
执行下面代码,错误的是def f(x, y = 0, z = 0): pass # 空语句,定义空函数体 A: f(1, x = 1, z = 3) B: f(z = 3, x = 1, y = 2) C: f(1, z = 3) D: f(1, y = 2, z = 3)
执行下面代码,错误的是def f(x, y = 0, z = 0): pass # 空语句,定义空函数体 A: f(1, x = 1, z = 3) B: f(z = 3, x = 1, y = 2) C: f(1, z = 3) D: f(1, y = 2, z = 3)
u(n)的z变换的收敛域为() A: |z|>1 B: |z|<3 C: |z|>3 D: |z|<1
u(n)的z变换的收敛域为() A: |z|>1 B: |z|<3 C: |z|>3 D: |z|<1
已知x(n)={1, 2, 3},y(n)={1, 2, 1},则x(n)*y(n)=________。(下划线表示n=0) A: {1, 4, 8, 8, 3} B: {1, 4, 8, 8, 3} C: {1, 4, 8, 8, 3} D: {1, 4, 8, 8, 3}
已知x(n)={1, 2, 3},y(n)={1, 2, 1},则x(n)*y(n)=________。(下划线表示n=0) A: {1, 4, 8, 8, 3} B: {1, 4, 8, 8, 3} C: {1, 4, 8, 8, 3} D: {1, 4, 8, 8, 3}
若P(A) = 1/2, P(B) = 1/3, P(B|A) = 2/3, 则P(A | B) = ( ). A: 0 B: 1 C: 1/6 D: 2/3
若P(A) = 1/2, P(B) = 1/3, P(B|A) = 2/3, 则P(A | B) = ( ). A: 0 B: 1 C: 1/6 D: 2/3