It is planned to use (7/9) of a piece of land for planting grass and (1/9) for planting trees. What percentage of the land is the land for planting trees less than the land for planting grass?
计划将一块地的(7/9)用于种草，(1/9)用于植树，植树的地面比种草的地面少占这块地的几分之几？
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(7/9) - (1/9)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>