What is the largest true fraction whose unit of fraction is (1/4).
分数单位是(1/4)的最大真分数是多少．
<gadget id="calculator">4 / 1</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>