207.2+389.7-157.6-109.1=how much.
207.2+389.7-157.6-109.1=多少．
<gadget id="calculator">389.7 - 157.6 - 109.1</gadget>
<output>123</output>

<gadget id="calculator">207.2 + 123</gadget>
<output>330.2</output>

<result>330.2</result>