A city is building a 12-kilometer-long expressway, and (3/4) has been built. How many kilometers have been built?
某市修建一条长12千米的高速公路，已经修建了(3/4)，已经修建了多少千米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12 * (3/4)</gadget>
<output>9</output>

<result>9</result>