2012*9+2012*8-2012*7=how much.
2012*9+2012*8-2012*7=多少．
<gadget id="calculator">2_012 * 9</gadget>
<output>18_108</output>

<gadget id="calculator">2_012 * 8</gadget>
<output>16_096</output>

<gadget id="calculator">2_012 * 7</gadget>
<output>14_084</output>

<gadget id="calculator">16_096 - 14_084</gadget>
<output>2_012</output>

<gadget id="calculator">18_108 + 2_012</gadget>
<output>20_120</output>

<result>20_120</result>