Calculation: 9.8*3.9*(2/5)/1.7/1.4/(2/15).
计算：9.8*3.9*(2/5)/1.7/1.4/(2/15)．
<gadget id="calculator">9.8 / 1.4</gadget>
<output>7</output>

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

<gadget id="calculator">17 / 10</gadget>
<output>17/10 = around 1.7</output>

<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(2/5) / (17/10) / (7/5) / (2/15)</gadget>
<output>150/119 = around 1.260504</output>

<gadget id="calculator">7 * 3.9 * (150/119)</gadget>
<output>34.411765</output>

<result>34.411765</result>