If the length of a rectangle increases (6/25) and the width decreases (3/4), how much does the area decrease?
某长方形，长增加(6/25)，宽减少(3/4)，面积减少多少．
<gadget id="calculator">69 / 100</gadget>
<output>69/100 = around 0.69</output>

<result>69/100 = around 0.69</result>