12345*99+12345*999-12345*98=how many.
12345*99+12345*999-12345*98=多少．
<gadget id="calculator">12_345 * 99</gadget>
<output>1_222_155</output>

<gadget id="calculator">12_345 * 999</gadget>
<output>12_332_655</output>

<gadget id="calculator">12_345 * 98</gadget>
<output>1_209_810</output>

<gadget id="calculator">12_332_655 - 1_209_810</gadget>
<output>11_122_845</output>

<gadget id="calculator">1_222_155 + 11_122_845</gadget>
<output>12_345_000</output>

<result>12_345_000</result>