Cut a watermelon into seven pieces of the same size, Xiaohua ate 4 pieces, and he ate ((())/(())) of this watermelon.
把1个西瓜切成同样大小的七块，小花吃了4块，他吃了这个西瓜的((())/(()))．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>