(1)3x+7=32-2x(2)3x-7(x-1)=3-2(x+3)(3)x+14-1=2x-16.
(1)3x+7=32-2x(2)3x-7(x-1)=3-2(x+3)(3)x+14-1=2x-16.
设随机变量X~b(5,1/2),则P{X>1}= A: 1/32 B: 5/32 C: 13/16 D: 31/32
设随机变量X~b(5,1/2),则P{X>1}= A: 1/32 B: 5/32 C: 13/16 D: 31/32
设f(x)=x2+bx+c且f(0)=f(2),则( ) A: f(-2)<c<f(32) B: f(32)<c<f(-2) C: f(32)<f(-2)<c D: c<f(32)<f(-2)
设f(x)=x2+bx+c且f(0)=f(2),则( ) A: f(-2)<c<f(32) B: f(32)<c<f(-2) C: f(32)<f(-2)<c D: c<f(32)<f(-2)
求微分方程[img=364x55]17da65386dfd612.png[/img]的通解; ( ) A: - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) B: (3*sin(2*x)*exp(x))/32 - (sin(6*x)*exp(x))/32 - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) C: - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) D: (sin(6*x)*exp(x))/32 - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x)
求微分方程[img=364x55]17da65386dfd612.png[/img]的通解; ( ) A: - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) B: (3*sin(2*x)*exp(x))/32 - (sin(6*x)*exp(x))/32 - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) C: - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) D: (sin(6*x)*exp(x))/32 - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x)
已知 x = 2,那么执行语句 x **= 5 之后,x的值为32
已知 x = 2,那么执行语句 x **= 5 之后,x的值为32
设int x=16,则表达式x*=2运行后变量x 的值为32。
设int x=16,则表达式x*=2运行后变量x 的值为32。
曲线\( {y^2} = x,\;{x^2} = z \)在点\( (4, - 2,16) \)处的切向量为(-4,______ ,-32)
曲线\( {y^2} = x,\;{x^2} = z \)在点\( (4, - 2,16) \)处的切向量为(-4,______ ,-32)
以\( xOy \) 面上的圆周\( {x^2} + {y^2} = ax \) 所围区域为底,曲面\( z = {x^2} + {y^2} \) 为顶的曲顶柱体的体积为( ) A: \( {3 \over {32}}\pi {a^4} \) B: \( {5 \over {32}}\pi {a^4} \) C: \( {7 \over {32}}\pi {a^4} \) D: \( {9 \over {32}}\pi {a^4} \)
以\( xOy \) 面上的圆周\( {x^2} + {y^2} = ax \) 所围区域为底,曲面\( z = {x^2} + {y^2} \) 为顶的曲顶柱体的体积为( ) A: \( {3 \over {32}}\pi {a^4} \) B: \( {5 \over {32}}\pi {a^4} \) C: \( {7 \over {32}}\pi {a^4} \) D: \( {9 \over {32}}\pi {a^4} \)
已知随机变量X~B(n,1/2),且P{X=5}=1/32,则n=___________
已知随机变量X~B(n,1/2),且P{X=5}=1/32,则n=___________
X为随机变量,E(X)=-1,D(X)=3,则E{3(X^2)+20}=()? A: 18 B: 9 C: 30 D: 32
X为随机变量,E(X)=-1,D(X)=3,则E{3(X^2)+20}=()? A: 18 B: 9 C: 30 D: 32