The road repair team builds a road. Of those who built this road in the morning (3/9), and those who repaired this road less than in the afternoon (1/9), what percentage are left unrepaired?
修路队修一条公路．上午修了这条路的(3/9)，比下午少修这条路的(1/9)，还剩几分之几没有修？
<gadget id="calculator">3 / 9</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) + (1/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (1/3) - (4/9)</gadget>
<output>2/9 = around 0.222222</output>

<result>2/9 = around 0.222222</result>