What is the formula of 2.1-2.09=0.01, 0.01*4.5=0.045, 0.045/0.45=0.1 into a comprehensive formula.
将2.1-2.09=0.01，0.01*4.5=0.045，0.045/0.45=0.1这三道算式列成一道综合算式是多少．
<gadget id="calculator">2.1 - 2.09</gadget>
<output>0.01</output>

<gadget id="calculator">0.01 / 4.5 / 0.45</gadget>
<output>0.004938</output>

<result>0.004938</result>