The snail climbed 0.1 meters more every hour than the previous hour. The snail climbed 1.9 meters in the 10th hour. How many meters did the snail climb in the 1st hour?
蜗牛每小时都比前1小时多爬0.1米，第10个小时蜗牛爬了1.9米，第1小时蜗牛爬了多少米．
<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>