设X,Y为两个随机变量,且P{X ³0,Y ³ 0} = 3/7 , P{X ³ 0} = P{ Y ³ 0} = 4/7 ,则P{max(X, Y) ³ 0} = ( ). A: 1/7 B: 3/7 C: 4/7 D: 5/7
设X,Y为两个随机变量,且P{X ³0,Y ³ 0} = 3/7 , P{X ³ 0} = P{ Y ³ 0} = 4/7 ,则P{max(X, Y) ³ 0} = ( ). A: 1/7 B: 3/7 C: 4/7 D: 5/7
阅读下面的java语言代码,输出结果是( )。 int x, y = 1, z=0; if( z < 0 ) x= 3; else if ( y == 0 ) x= 5; else x= 7; System.out.println(x+”,”+ y); A: 7, 0 B: 7, 1 C: 3, 3 D: 以上都不正确
阅读下面的java语言代码,输出结果是( )。 int x, y = 1, z=0; if( z < 0 ) x= 3; else if ( y == 0 ) x= 5; else x= 7; System.out.println(x+”,”+ y); A: 7, 0 B: 7, 1 C: 3, 3 D: 以上都不正确
下列哪条语句是正确的( ) A: A=[1 2;3 4];B=[3;7];A.*B; B: A=cell(2,3);A(1,2)=[4;5]; C: A=[2 3 5 7;9 4 6 1;7 3 2 5];B=[1 7;0 5];A(2:end,2:2:end) D: x=-5:5;y=-5:5;z=x.*x-y.*y;surf(x,y,z);
下列哪条语句是正确的( ) A: A=[1 2;3 4];B=[3;7];A.*B; B: A=cell(2,3);A(1,2)=[4;5]; C: A=[2 3 5 7;9 4 6 1;7 3 2 5];B=[1 7;0 5];A(2:end,2:2:end) D: x=-5:5;y=-5:5;z=x.*x-y.*y;surf(x,y,z);
变量Y必须同时满足以下两条件:①能被4整除,但不能被5整除;②能被3整除。下列逻辑表达式正确的是(&&代表与,||代表或) A: y%4==0 && y%5!=0 || y%3==0 B: y%4==0 && y%5!=0 && y%3==0 C: y%4==0 || y%5!=0 || y%3==0 D: y%4==0 || y%5!=0 && y%3==0
变量Y必须同时满足以下两条件:①能被4整除,但不能被5整除;②能被3整除。下列逻辑表达式正确的是(&&代表与,||代表或) A: y%4==0 && y%5!=0 || y%3==0 B: y%4==0 && y%5!=0 && y%3==0 C: y%4==0 || y%5!=0 || y%3==0 D: y%4==0 || y%5!=0 && y%3==0
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
下面的C语言代码,输出结果是:( )int x, y, z;y=1;z=0;if ( z <; 0 ){x = 3;}else if ( y = = 0 ){x = 5;}else{x = 7;}printf("x=%d",x); A: x=3 B: x=5 C: x=7 D: x为随机数
下面的C语言代码,输出结果是:( )int x, y, z;y=1;z=0;if ( z <; 0 ){x = 3;}else if ( y = = 0 ){x = 5;}else{x = 7;}printf("x=%d",x); A: x=3 B: x=5 C: x=7 D: x为随机数
差分方程 y(x+1) - 5 y(x) = 3, y(0) = 7/3 的解为 未知类型:{'options': ['', '', '', ''], 'type': 102}
差分方程 y(x+1) - 5 y(x) = 3, y(0) = 7/3 的解为 未知类型:{'options': ['', '', '', ''], 'type': 102}
【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]
【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]
描述一个正整数n能同时被3,5和7同时整除的正确表达式为 A: n//3==0 and n//5==0 and n//7==0 B: n//3==0 or n//5==0 or n//7==0 C: n%3==0 and n%5==0 and n%7==0 D: n%3==0 or n%5==0 or n%7==0
描述一个正整数n能同时被3,5和7同时整除的正确表达式为 A: n//3==0 and n//5==0 and n//7==0 B: n//3==0 or n//5==0 or n//7==0 C: n%3==0 and n%5==0 and n%7==0 D: n%3==0 or n%5==0 or n%7==0
17e0c39b09a63f9.png在作业本或答题纸上写出完整的解题过程,平台上完成以下选择题:(1)P{X=1,Y=0}; (2)P{Y=2};(3)P{X+Y<;2}. A: 5/28; 5/14; 2/7 B: 5/28; 5/28; 3/7 C: 5/56; 5/14; 2/7 D: 5/56; 5/28; 3/7
17e0c39b09a63f9.png在作业本或答题纸上写出完整的解题过程,平台上完成以下选择题:(1)P{X=1,Y=0}; (2)P{Y=2};(3)P{X+Y<;2}. A: 5/28; 5/14; 2/7 B: 5/28; 5/28; 3/7 C: 5/56; 5/14; 2/7 D: 5/56; 5/28; 3/7