123*1+57*65-65*56=how much.
123*1+57*65-65*56=多少．
<gadget id="calculator">123 * 1</gadget>
<output>123</output>

<gadget id="calculator">57 * 65</gadget>
<output>3_705</output>

<gadget id="calculator">65 * 56</gadget>
<output>3_640</output>

<gadget id="calculator">3_705 - 3_640</gadget>
<output>65</output>

<gadget id="calculator">123 + 65</gadget>
<output>188</output>

<result>188</result>