(2121/2323)*(171717/212121)=how much.
(2121/2323)*(171717/212121)=多少．
<gadget id="calculator">2_121 / 2_323</gadget>
<output>21/23 = around 0.913043</output>

<gadget id="calculator">171_717 / 212_121</gadget>
<output>17/21 = around 0.809524</output>

<gadget id="calculator">(21/23) * (17/21)</gadget>
<output>17/23 = around 0.73913</output>

<result>17/23 = around 0.73913</result>