book, read every day (1/8), how much is this book read in 4 days
一本书，每天看(1/8)，4天看这本书的多少
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) * 4</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>