A piece of cloth with a length of 8.6 meters takes 2.8 meters to make a coat and 2.1 meters to make trousers. How much rice is left? (Write out the quantitative relation and solve it)
一块长8.6米的布，做上衣用去2.8米，做裤子用去2.1米．还剩多少米？(写出数量关系式并解答)
<gadget id="calculator">8.6 - 2.8 - 2.1</gadget>
<output>3.7</output>

<result>3.7</result>