A piece of steel with a side length of 5 decimeters is 7.8 kilograms per cubic decimeter. How many kilograms does this piece of steel weigh?
一段棱长为5分米的正方体的钢材，每立方分米钢重7.8千克，这根钢材重多少千克？
<gadget id="calculator">5 * 5 * 5 * 7.8</gadget>
<output>975</output>

<result>975</result>