已知函数f(x)=x21+x2,则f(2)+f(12)的值为______.
已知函数f(x)=x21+x2,则f(2)+f(12)的值为______.
(x^21)^2的次数是
(x^21)^2的次数是
设X为随机变量,E(X)=2,D(X)=5,则E(X+2)2=() A: 4 B: 9 C: 13 D: 21
设X为随机变量,E(X)=2,D(X)=5,则E(X+2)2=() A: 4 B: 9 C: 13 D: 21
(x^4x)(x^21)
(x^4x)(x^21)
已知X和Y的真值,求[X+Y]补=?(1)X=-1110111B,Y=+1011010B(2)X=56,Y=-21
已知X和Y的真值,求[X+Y]补=?(1)X=-1110111B,Y=+1011010B(2)X=56,Y=-21
设X为随机变量,E(X)=2,D(X)=5,则X平方的数学期望是( ). A: 4 B: 9 C: 13 D: 21
设X为随机变量,E(X)=2,D(X)=5,则X平方的数学期望是( ). A: 4 B: 9 C: 13 D: 21
(2)从$0$到$2s$内质点的位移; A: $-12\hat{x}m$ B: $21\hat{x}m$ C: $16\hat{x}m$ D: $12\hat{x}m$
(2)从$0$到$2s$内质点的位移; A: $-12\hat{x}m$ B: $21\hat{x}m$ C: $16\hat{x}m$ D: $12\hat{x}m$
数学式 A: (e^(2*x)*Log(x)+x^2)/Sqr(Abs(Sinx^2-Cos2x)) B: (Exp(2*x)*Log(x)+x^2)/Sqr(Abs(Sin(x^2)-Cos(x)^2)) C: (Exp(2*x)*Ln(x)+x^2)/Sqr(Abs(Sin(x^2)-Cos(x)^2)) D: (e^(2*x)*Log(x)+x^2)/Sqr(Abs(Sin(x)^2-Cos(x)^2))
数学式 A: (e^(2*x)*Log(x)+x^2)/Sqr(Abs(Sinx^2-Cos2x)) B: (Exp(2*x)*Log(x)+x^2)/Sqr(Abs(Sin(x^2)-Cos(x)^2)) C: (Exp(2*x)*Ln(x)+x^2)/Sqr(Abs(Sin(x^2)-Cos(x)^2)) D: (e^(2*x)*Log(x)+x^2)/Sqr(Abs(Sin(x)^2-Cos(x)^2))
2补码运算,请写出补码,【X+Y】补和【X-Y】补分别为多少(2)X=56Y=-21【X】补=B;【Y】补=B【X+Y】补=【X】补+【Y】补=B
2补码运算,请写出补码,【X+Y】补和【X-Y】补分别为多少(2)X=56Y=-21【X】补=B;【Y】补=B【X+Y】补=【X】补+【Y】补=B
求微分方程[img=101x35]17da5f15503f795.png[/img] 的通解,实验命令为(). A: dsolve(Dy+2*x*y=x*exp(-x^2))ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 B: dsolve('Dy+2*x*y=x*exp(-x^2)','x')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 C: dsolve('Dy+2*x*y=x*exp(-x^2)')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2
求微分方程[img=101x35]17da5f15503f795.png[/img] 的通解,实验命令为(). A: dsolve(Dy+2*x*y=x*exp(-x^2))ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 B: dsolve('Dy+2*x*y=x*exp(-x^2)','x')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 C: dsolve('Dy+2*x*y=x*exp(-x^2)')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2