解:$(1)$答案不唯一$.$
$(2)$当$x=\frac {1}{5}$时,$5×(\frac {1}{5})²-1=5×\frac {1}{25}-1=\frac {1}{5}-1=-\frac {4}{5}$,
所以输出的值为$-\frac {4}{5}.$
当$x=\frac {1}{2}$时,$5×(\frac {1}{2})²-1=5×\frac {1}{4}-1=\frac {5}{4}-1=\frac {1}{4}$,
所以输出的值为$\frac {1}{4}.$