A cuboid glass fish tank without a cover measures 6.4 decimeters in length, 5.2 decimeters in width and 5.2 decimeters in height when measured from the outside. It is known that the thickness of the glass is 2 cm, what is the maximum volume of the fish tank in cubic decimeters?
一个无盖的长方体玻璃鱼缸，从外面量，长6.4分米，宽5.2分米，高5.2分米．已知玻璃厚2厘米，鱼缸的最大容积是多少立方分米？
<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * 2</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">6.4 - (2/5)</gadget>
<output>6</output>

<gadget id="calculator">5.2 - (2/5)</gadget>
<output>4.8</output>

<gadget id="calculator">5.2 - (1/5)</gadget>
<output>5</output>

<gadget id="calculator">6 * 4.8 * 5</gadget>
<output>144</output>

<result>144</result>