x |
x+2 |
x |
3x+4 |
x |
7x+8 |
x |
15x+16 |
所給的函數(shù)式的分子不變都是x,
而分母是由兩部分的和組成,
第一部分的系數(shù)分別是1,3,7,15…2n-1,
第二部分的數(shù)分別是2,4,8,16…2n
∴fn(x)=f(fn-1(x))=
x |
(2n?1)x+2n |
故答案為:C
x |
x+2 |
x |
x+2 |
x |
3x+4 |
x |
7x+8 |
x |
15x+16 |
x |
(2n?1)x+2n |
x |
(2n?1)x+2n |
x |
(2n?1)x+2n |
x |
(2n?1)x+2n |
x |
x+2 |
x |
3x+4 |
x |
7x+8 |
x |
15x+16 |
x |
(2n?1)x+2n |