10 kilograms of apples, the first time to eat (1/2) of the total, the second time to eat the rest (3/5), the second time to eat how much 10 kilograms
10千克苹果，第一次吃去总数的(1/2)，第二次吃去余下的(3/5)，第二次吃去了10千克的多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 * (1/2) * (3/5)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>