Calculation: ((7/10)+(2/5)-(1/3))/(7/30).
计算：((7/10)+(2/5)-(1/3))/(7/30)．
<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

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

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(2/5) - (1/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(7/10) + (1/15)</gadget>
<output>23/30 = around 0.766667</output>

<gadget id="calculator">7 / 30</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">(23/30) / (7/30)</gadget>
<output>23/7 = around 3.285714</output>

<result>23/7 = around 3.285714</result>