The base length of a triangle is 5m. If the base is extended by 10dm, the area will increase by 1.5m**2. Please find out the area of the original triangle in square meters?
一个三角形的底长是5m，如果底边延长10dm，那么面积就增加1.5m**2，请你求出原来三角形的面积是多少平方米？
<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<gadget id="calculator">2 / 1 / 2</gadget>
<output>1</output>

<gadget id="calculator">5 * 1.5 * 1</gadget>
<output>7.5</output>

<result>7.5</result>