A machinery factory planned to produce 45,000 machines last year, but actually completed the annual plan (3/5) in the first half of the year, and exceeded production (7/45) in the whole year. How many thousands of machines were actually produced in the second half of last year?
某机械厂去年计划生产机器4.5万台，实际上半年完成全年计划的(3/5)，全年超产(7/45)，去年下半年实际生产机器多少万台？
<gadget id="calculator">7 / 45</gadget>
<output>7/45 = around 0.155556</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(7/45) - (3/5)</gadget>
<output>-4/9 = around -0.444444</output>

<gadget id="calculator">1 + (-4/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">4.5 * (5/9)</gadget>
<output>2.5</output>

<result>2.5</result>