又f(x+1)=f(x-1),∴f(x-1)=f(1-x),即f(x)=f(-x),故函數(shù)f(x)為偶函數(shù).
再由f(x+1)=f(x-1)可得f(x+2)=f(x),故函數(shù)f(x)是周期等于2的周期函數(shù),
∵f(
1 |
2 |
∴f(-
1 |
2 |
1 |
2 |
3 |
2 |
故函數(shù)f(x)在一個周期[0,2]上有2個零點,即函數(shù)f(x)在每兩個整數(shù)之間都有一個零點,
∴f(x)=0在區(qū)間[0,2013]內(nèi)根的個數(shù)為2013,
故選C;