cuboid copper bar is 2 meters long, cut it into two sections, one of which is just a cube, so the surface area is increased by 50 square centimeters. A copper bar weighs 8.9 kilograms per cubic decimeter. How many kilograms did this copper bar originally weigh?
一根长方体铜条长2米，把它截成两段，其中的一小段刚好是正方体，这样表面积增加了50平方厘米．铜条每立方分米重8.9千克，这根铜条原来重多少千克？
<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">8.9 * 25 * 2 * 10</gadget>
<output>4_450</output>

<result>4_450</result>