Divide 1 yuan into 100 parts on average, such 9 parts are 1 yuan ((())/(())), and use decimals to express the number of writing.
把1元平均分成100份，这样的9份是1元的((())/(()))，用小数表示写作多少．
<gadget id="calculator">9 / 100</gadget>
<output>9/100 = around 0.09</output>

<result>9/100 = around 0.09</result>