Calculation: (9/10)-((9/10)-(3/5)).
计算：(9/10)-((9/10)-(3/5))．
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(9/10) - (3/5)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(9/10) - (3/10)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>