cylinder and a cone have the same base and height, and the sum of their volumes is 12.8dm**3, so what is the difference between their volumes in dm**3.
一个圆柱和圆锥等底等高，它们的体积之和是12.8dm**3，那么它们的体积之差是多少dm**3．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">12.8 * (3/4)</gadget>
<output>9.6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12.8 * (1/4)</gadget>
<output>3.2</output>

<gadget id="calculator">9.6 - 3.2</gadget>
<output>6.4</output>

<result>6.4</result>