10. 已知函数y=f(x)y=f(x)y=f(x)的周期为2,当x∈[−1x\in [-1x∈[−1,1]1]1]时,f(x)=2∣x∣−1f(x)=2^{\vert x\vert }-1f(x)=2∣x∣−1.如果F(x)=f(x)−∣log5x∣F(x)=f(x)-\vert \log _{5}x\vertF(x)=f(x)−∣log5x∣,那么F(x)F(x)F(x)的零点个数是((( )))