A piece of wood is (9/10) meters long, (3/10) meters are cut off the first time, and the remaining (2/3) is cut off the second time, how many meters are cut off the second time.
一段木料长(9/10)米，第一次锯下了(3/10)米，第二次锯下了剩下的(2/3)，第二次锯下了多少米．
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(9/10) - (3/10)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(3/5) * (2/3)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>