已知函数f(x) =2x+1,x∈R.规定:给定一个实数x0,赋值x1= f(x0),若x1≤255,则继续赋值x2=" f(x1)" …,以此类推,若x n-1≤255,则xn= f(xn-1),否则停止赋值,如果得到xn后停止,则称赋值了n次(n∈N *).已知赋值k次后该过程停止,则x0的取值范围是
A.(2k-9 ,2 k-8] | B.(2 k-8 -1, 2k-9-1] | C.(28-k -1, 29-k-1] | D.(27-k -1, 28-k-1] |
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已知函数f(x) =2x+1,x∈R.规定:给定一个实数x0,赋值x1= f(x0),若x1≤255,则继续赋值x2=" f(x1)" …,以此类推,若x n-1≤255,则xn= f(xn-1),否则停止赋值,如果得到xn后停止,则称赋值了n次(n∈N *).已知赋值k次后该过程停止,则x0的取值范围是
A.(2k-9 ,2 k-8] | B.(2 k-8 -1, 2k-9-1] | C.(28-k -1, 29-k-1] | D.(27-k -1, 28-k-1] |