Find the rules and fill in the numbers. 12.7, 11.5, 10.3, how many.
找规律填数．12.7，11.5，10.3，多少．
<gadget id="calculator">12.7 - 11.5</gadget>
<output>1.2</output>

<gadget id="calculator">10.3 - 1.2</gadget>
<output>9.1</output>

<result>9.1</result>