(7.88+6.77+5.66)*(9.31+10.98+10)-(7.88+6.77+5.66+10)*(9.31+10.98)=how much.
(7.88+6.77+5.66)*(9.31+10.98+10)-(7.88+6.77+5.66+10)*(9.31+10.98)=多少．
<gadget id="calculator">7.88 + 6.77 + 5.66</gadget>
<output>20.31</output>

<gadget id="calculator">9.31 + 10.98 + 10</gadget>
<output>30.29</output>

<gadget id="calculator">20.31 * 30.29</gadget>
<output>615.1899</output>

<gadget id="calculator">7.88 + 6.77 + 5.66 + 10</gadget>
<output>30.31</output>

<gadget id="calculator">9.31 + 10.98</gadget>
<output>20.29</output>

<gadget id="calculator">30.31 * 20.29</gadget>
<output>614.9899</output>

<gadget id="calculator">615.1899 - 614.9899</gadget>
<output>0.2</output>

<result>0.2</result>