A cuboid fish tank is 6 decimeters long, 4.5 decimeters wide, and 5 decimeters high. The glass below and on the right is broken. How many square decimeters of glass are needed to repair the fish tank?
一个长方体鱼缸，长6分米，宽4.5分米，高5分米，它下面和右面的玻璃打碎了，要修好这个鱼缸，需要多少平方分米的玻璃？
<gadget id="calculator">6 * 4.5</gadget>
<output>27</output>

<gadget id="calculator">4.5 * 5</gadget>
<output>22.5</output>

<gadget id="calculator">27 + 22.5</gadget>
<output>49.5</output>

<result>49.5</result>