What is 15.7-(5.7-3.8) equal to
15.7-(5.7-3.8)等于多少
<gadget id="calculator">5.7 - 3.8</gadget>
<output>1.9</output>

<gadget id="calculator">15.7 - 1.9</gadget>
<output>13.8</output>

<result>13.8</result>