What is the area of 5 squares with area 1 and 4 rectangles with area 1 to form a large square?
5个面积为1的正方形和4个面积为1的长方形，拼成一个大正方形，面积是多少
<gadget id="calculator">5 * 1</gadget>
<output>5</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<result>9</result>