An engineering team repaired a canal, 500 meters in the first week, 700 meters in the second week, and (1/5) remained unrepaired. How long is this canal?
某工程队修一条水渠，第一周修了500米，第二周修了700米，还剩(1/5)没有修，这条水渠有多长？
<gadget id="calculator">500 + 700</gadget>
<output>1_200</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1_200 / (4/5)</gadget>
<output>1_500</output>

<result>1_500</result>