A snail climbs 0.1 meters more per hour than the previous hour, and the snail climbed 1.9 meters in the tenth hour, how many meters did it climb in the first hour?
一只蜗牛每小时都比前一小时多爬0.1米，这只蜗牛第十小时爬了1.9米，那么第一小时爬了多少米．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 0.1</gadget>
<output>0.9</output>

<gadget id="calculator">1.9 - 0.9</gadget>
<output>1</output>

<result>1</result>