Calculate it any way you like. ((4/5)-45%)*(40%-40%)
用你喜欢的方法计算．((4/5)-45%)*(40%-40%)
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">45 / 100</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">(4/5) - (9/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) - (2/5)</gadget>
<output>0</output>

<gadget id="calculator">(7/20) * 0</gadget>
<output>0</output>

<result>0</result>