17/7-10/7=how much.
17/7-10/7=多少．
<gadget id="calculator">17 / 7</gadget>
<output>17/7 = around 2.428571</output>

<gadget id="calculator">10 / 7</gadget>
<output>10/7 = around 1.428571</output>

<gadget id="calculator">(17/7) - (10/7)</gadget>
<output>1</output>

<result>1</result>