On a mountain, (1/5) is planted with peach trees, (3/10) is planted with pear trees, and the rest is planted with apple trees. What percentage of the area of the mountain is planted with apple trees?
一块山地上，(1/5)种桃树，(3/10)种梨树，剩下的部分种苹果树，种苹果树的面积占这块山地面积的几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/5) - (1/10)</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>