A square log, the bottom surface is a square with a side length of 0.8 decimeters, and a section with a volume of 1.28 cubic decimeters is cut from the square log, how long should it be cut? (solution by equation)
一根方木，底面是边长0.8分米的正方形，从方木上截下体积是1.28立方分米的一段，要截多长？(用方程解)
<gadget id="calculator">0.8 * 0.8</gadget>
<output>0.64</output>

<gadget id="calculator">1.28 / 0.64</gadget>
<output>2</output>

<result>2</result>