A residential community planted 45 trees this year. It is known that the number of trees planted last year was equivalent to (4/5) this year. How many more trees are planted this year than last year?
某安居小区今年植树45棵，已知去年植树的棵数相当于今年的(4/5)，今年比去年多植树多少棵？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">45 * (1/5)</gadget>
<output>9</output>

<result>9</result>