Xiao Ming bought (1/2) kilogram of biscuits and ate (1/4) kilogram, how many kilograms are left? What is the correct column
小明买了(1/2)千克饼干，吃了(1/4)千克，还剩多少千克？正确的列式是多少
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/2) - (1/4)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>