Grandpa Li has a vegetable field. He uses (5/7) of the vegetable field to grow cabbage and (2/7) to grow celery. What percentage of the vegetable field does cabbage use more than celery?
李爷爷有块菜地，他用菜地的(5/7)种白菜，用(2/7)种芹菜．白菜比芹菜多用了菜地的几分之几？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(5/7) - (2/7)</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>