A barrel of oil weighs 3 kilograms, and the known barrel weighs 260 grams. What is the net content of this barrel of oil?
一桶油连桶重3千克，已知桶重260克，这桶油的净含量是多少？
<gadget id="calculator">3 * 1_000</gadget>
<output>3_000</output>

<gadget id="calculator">3_000 - 260</gadget>
<output>2_740</output>

<result>2_740</result>