The side length of a square is increased by (1/4) the original area, and the current area is equal to the original area.
一个正方形的边长增加原来的(1/4)，现在面积是原来面积的多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 * 1</gadget>
<output>1</output>

<gadget id="calculator">(5/4) / 1</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(5/4) * (5/4)</gadget>
<output>25/16 = around 1.5625</output>

<result>25/16 = around 1.5625</result>