Cut out the largest square from a rectangular piece of paper with a length of 4 cm and a width of 3 cm, and the remaining area is reduced by how much.
把长4厘米，宽3厘米的长方形纸片剪去一个最大的正方形，剩下的面积比原来减少了多少．
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">12 - 9</gadget>
<output>3</output>

<gadget id="calculator">3 / 12</gadget>
<output>1/4 = around 0.25</output>

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