For a triangle, if the base is extended by 1m and the height remains the same, then the area will increase by 1.5m**2; if the base remains the same and the height is extended by 1m, then the area will increase by 2.5m**2. Please find the area of the original triangle in square meters?
一个三角形，如果底边延长1m，高不变，那么面积就增加1.5m**2；如果底不变，高延长1m，那么面积就增加2.5m**2．请你求出原来三角形的面积是多少平方米？
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">1.5 * 2</gadget>
<output>3</output>

<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">3 * (5/2)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>