A steel pipe with a length of 3 meters is first subtracted from (1/2), and then subtracted from (1/2) meters, how many meters are left.
一个长是3米的钢管先减去(1/2)，后减去(1/2)米，还剩多少米米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 * (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">3 - (3/2) - (1/2)</gadget>
<output>1</output>

<result>1</result>