A tree planting team planned to plant 3,000 trees in March, completed the plan in the first half of the month (3/5), and completed the plan in the second half of the month (7/10). How many more trees did the tree planting team plant than planned in March?
一个植树队三月份计划植树3000棵，上半月完成了计划的(3/5)，下半月完成了计划的(7/10)．这个植树队三月份比计划多植树多少棵？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/10) - 1</gadget>
<output>-3/10 = around -0.3</output>

<gadget id="calculator">(3/5) + (-3/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">3_000 * (3/10)</gadget>
<output>900</output>

<result>900</result>