A rectangle with a length of 6 decimeters and a width of 4 decimeters is reduced by 1:2 to obtain the area of the figure in square decimeters.
一个长6分米，宽4分米的长方形，按1：2缩小后得到的图形面积是多少平方分米．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>