A square with a side length of 5 cm increases its area by 5 cm when its side length increases by 5 cm.
一个边长为5厘米的正方形，它的边长增加5厘米后，面积增加多少平方厘米．
<gadget id="calculator">5 + 5</gadget>
<output>10</output>

<gadget id="calculator">10 * 10</gadget>
<output>100</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">100 - 25</gadget>
<output>75</output>

<result>75</result>