If the two adjacent sides of a rectangle are respectively increased by (1/3) and (1/4), the area is increased by how much
一个长方形相邻两边分别增加各自的(1/3)和(1/4)，面积就比原来增加多少
<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 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">4 * (5/4) * 3 * (4/3)</gadget>
<output>20</output>

<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">20 - 12</gadget>
<output>8</output>

<gadget id="calculator">8 / 12</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>