求In=∫fnexdx (n∈N)
求In=∫fnexdx (n∈N)
求In=∫fnexdx (n∈N)
A. before August 15th
B. after August 15th
C. August 1st to 15th,all dates inclusive
D. August 1st to 15th,exchding August 1st
They hoped to find a new continent _____ in the Indian or Pacific Ocean. |
[ ] |
A. which they thought was existed B. where they thought existed C. where they thought to be existed D. which they thought existed |
B.2.I must say no to you and I’ll give you the reason.
C.3.I am afraid we can’t agree to that, but I hope to do business with you some other day.
D.4.I need some time to think about that.
A.当f(x)是奇函数时,F(x)必是偶函数
B.当f(x)是偶函数时,F(x)必是奇函数
C.当f(x)是周期函数,F(x)必为周期函数
D.当f(x)是单调增函数,F(x)必为单调增函数
设e-x是f(x)的一个原函数,则∫xf(x)dx=( ).
A.e-x(1-x)+c B.e-x(x+1)+c
C.e-x(x-1)+c D.-e-x(x+1)+c
若∫f(x)dx=x2e2x+c,则f(x)=( ).
A.2xe2xB.2x2e2xC.xe2xD.2xe2x(1+x)
函数2(e2x-e-2x)的原函数有( ).
A.(ex+e-x)2B.(ex-e-x)2
C.ex+e-xD.4(e2x+e-2x)
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