1 hectare of broad-leaved forest absorbs 1000 kg of carbon dioxide and releases 730 kg of oxygen. Use the formula to express the number of kilograms more carbon dioxide absorbed by m hectares of broad-leaved forest than the oxygen released.
1公顷阔叶林吸收二氧化碳1000千克，放出氧气730千克．用式子表示m公顷阔叶林吸收的二氧化碳比放出的氧气多的千克数．
<gadget id="calculator">1_000 - 730</gadget>
<output>270</output>

<result>270</result>