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设不定积分则有().A.I1=I2+xB.I1=I2-xC.I1=-I2D.I1=I2
设不定积分则有().
A.I1=I2+x
B.I1=I2-x
C.I1=-I2
D.I1=I2
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设不定积分则有().
A.I1=I2+x
B.I1=I2-x
C.I1=-I2
D.I1=I2
设f(x)是严格减小的连续函数,0<a<c.记
则().
A.I1>I2
B.I1<I2
C.I1=I2
D.I1与I2的关系不能确定
A.设c是常数,则有E(C)=C
B.设X是一个随机变量,C是常数,则有E(CX)=CE(X)
C.设X,Y是两个随机变量,则有E(X+Y)=E(X)+E(Y)
D.设X,Y是相互独立的随机变量,则有E(XY)=E(X)E(Y)
A.设c是常数,则D(C)=0
B.设X是随机变量,C是常数,则有D(CX)=C2D(X)
C.设X是随机变量,C是常数,则有D(X+C)=D(X)
D.若X和Y相互独立,则有D(X+Y)=D(X)+D(Y)