The two right-angled sides of a piece of right-angled triangle land are 9dm and 10dm respectively, what is the area of the land in m**2.
一块直角三角形的土地两条直角边分别是9dm和10dm，这块地的面积是多少m**2．
<gadget id="calculator">10 / 2 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">9 * (1/20)</gadget>
<output>9/20 = around 0.45</output>

<result>9/20 = around 0.45</result>