Dad used two ropes with lengths of 3.2 meters and 1.27 meters to tie up the waste paper. There is 0.38 meters of common rope at the interface. How long is the rope after it is connected?
爸爸用两条长度分别是3.2米和1.27米的绳子接起来捆扎废纸．接口处共用去绳子0.38米，接好后的绳子有多长？
<gadget id="calculator">1.27 - 0.38</gadget>
<output>0.89</output>

<gadget id="calculator">3.2 + 0.89</gadget>
<output>4.09</output>

<result>4.09</result>