f(x)=1/x+[e^(1/2-x)]/(x-1)的间断点的个数是() A、0B、1C、2D、3
f(x)=1/x+[e^(1/2-x)]/(x-1)的间断点的个数是()
A、0
B、1
C、2
D、3
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2、求f(x)=x sin(2x-1)在0附近的最小值,相应的命令是()。A.[x,fval] = fminbnd(@(x) x*sin(2*x-1),0,0.5)B.[x,fval] = fminsearch(@(x) x*sin(2*x-1),0)C.[x,fval] = fminsearch(@(x) x*sin(2*x-1),0.5)D.[x,fval] = fminunc(@(x) x*sin(2*x-1),0)
求f(x)=x sin(2x-1)在0附近的最小值,相应的命令是()。A.[x,fval] = fminbnd(@(x) x*sin(2*x-1),0,0.5)B.[x,fval] = fminsearch(@(x) x*sin(2*x-1),0)C.[x,fval] = fminsearch(@(x) x*sin(2*x-1),0.5)D.[x,fval] = fminunc(@(x) x*sin(2*x-1),0)
设随机变量X~N(1,4),则以下结果正确的是A.D(X)=4E(X)B.P(X>-1)=Φ(1)C.0.5(X-1)~N(0,1)D.0.25(X-1)~N(0,1)E.2(X-1)~N(0,8)F.P(X<2)= Φ(1)G.D(X+1)=E(X+1)H.P(X<4)= Φ(1)
1、按如下递归公式求函数值:x=1时 f(x)=10;x不等于1时 f(x)=f(x-1)+2。