解由f(x)为偶函数
故f(-1/2)=f(1/2)
又由f(x)周期为2的偶函数
故f(2)=f(2-2)=f(0)
又有f(x)在[0,1]上单调递减
即f(0)>f(1/2)>f(1)
即f(2)>f(-1/2)>f(1).