A vegetable field (6/9) is planted with cabbage, and the remaining (3/9) is planted with radishes, how much less radish is planted than cabbage?
一块菜地(6/9)种了白菜，剩下的(3/9)种萝卜，种的萝卜比白菜少多少？
<gadget id="calculator">6 / 9</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/3) - (1/3)</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>