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}
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
y = [1, 2, 3, 4],y=y+[8] ,则y的取值不正确的是 A: [1, 2, 3, 4, 8] B: [8,1, 2, 3, 4,] C: [1, 2, 3, 8, 4] D: [1, 2, 8, 4,3]
y = [1, 2, 3, 4],y=y+[8] ,则y的取值不正确的是 A: [1, 2, 3, 4, 8] B: [8,1, 2, 3, 4,] C: [1, 2, 3, 8, 4] D: [1, 2, 8, 4,3]
x = 2,y = 3, x | y的值为 A: 3 B: 2 C: 1 D: 8
x = 2,y = 3, x | y的值为 A: 3 B: 2 C: 1 D: 8
设随机变量(X,Y)的联合密度函数为p(x,y)=k(6-x-y),0 (1) 1/8 (2) 3/8
设随机变量(X,Y)的联合密度函数为p(x,y)=k(6-x-y),0 (1) 1/8 (2) 3/8
函数y=2x的图像与直线x+3=0的交点坐标为() A: (-3,-1/6) B: (-3,-1/8) C: (-3,-1/6) D: (-3,-1/8)
函数y=2x的图像与直线x+3=0的交点坐标为() A: (-3,-1/6) B: (-3,-1/8) C: (-3,-1/6) D: (-3,-1/8)
假设x、y、z为整型变量,且x=2,y=3,z=10,则下列表达式中值为1的是 A: x y || z B: xz C: (!x y) || (yz) D: x !z || !(y z)
假设x、y、z为整型变量,且x=2,y=3,z=10,则下列表达式中值为1的是 A: x y || z B: xz C: (!x y) || (yz) D: x !z || !(y z)
已知:()x()-()y()=()1(),()z()-()y()=()2(),则()xy()+()yz()+()zx()-()x()2()-()y()2()-()z()2()的值是
已知:()x()-()y()=()1(),()z()-()y()=()2(),则()xy()+()yz()+()zx()-()x()2()-()y()2()-()z()2()的值是
设\(w = f(x + y + z,xyz)\),其中\(f\)有连续偏导数,则\( { { {\partial}w} \over {\partial {x}}} =\) A: \({f'_1} + yz{f'_2}\) B: \(x{f'_1} + yz{f'_2}\) C: \(yz{f'_1} +x{f'_2}\) D: \({f'_1} +{f'_2}\)
设\(w = f(x + y + z,xyz)\),其中\(f\)有连续偏导数,则\( { { {\partial}w} \over {\partial {x}}} =\) A: \({f'_1} + yz{f'_2}\) B: \(x{f'_1} + yz{f'_2}\) C: \(yz{f'_1} +x{f'_2}\) D: \({f'_1} +{f'_2}\)
已知点()(()-()1(),()y()1())(),()(2(),()y()2())(),()(()-()3(),()y()3())()都在函数()y()=()x()2()的图象上,则()()A.()y()1()<()y()2()<()y()3()B.()y()1()<()y()3()<()y()2()C.()y()3()<()y()2()<()y()1()D.()y()2()<()y()1()<()y()3
已知点()(()-()1(),()y()1())(),()(2(),()y()2())(),()(()-()3(),()y()3())()都在函数()y()=()x()2()的图象上,则()()A.()y()1()<()y()2()<()y()3()B.()y()1()<()y()3()<()y()2()C.()y()3()<()y()2()<()y()1()D.()y()2()<()y()1()<()y()3