Four numbers (7/10), (15/20), (13/15), and 0.8 are compared, what is the smallest number among them
四个数(7/10)，(15/20)，(13/15)，0.8比较大小，其中最小的数是多少
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>