问题
选择题
函数f(x)的递增区间是 (-2,3),则函数y=f(x+5)的递增区间是( )
A.(3,8)
B.(-7,-2)
C.(-2,3)
D.(0,5)
答案
函数y=f(x+5)是函数f(x)向左平移5个单位得到的,
∵函数f(x)在区间〔-2,3〕上是增函数,
∴y=f(x+5)增区间为(-2,3)向左平移5个单位,即增区间为(-7,-2)
故选B.
函数f(x)的递增区间是 (-2,3),则函数y=f(x+5)的递增区间是( )
A.(3,8)
B.(-7,-2)
C.(-2,3)
D.(0,5)
函数y=f(x+5)是函数f(x)向左平移5个单位得到的,
∵函数f(x)在区间〔-2,3〕上是增函数,
∴y=f(x+5)增区间为(-2,3)向左平移5个单位,即增区间为(-7,-2)
故选B.
An investor does research about investment return and gathers the following nformation about a portfolio:
Year | Return |
2009 | 11% |
2010 | 7% |
2011 | 3% |
A. less than the money-weighted rate of return.
B. the same as the money-weighted rate of return.
C. greater than the money-weighted rate of return.