99999*77778+33333*66666=how many.
99999*77778+33333*66666=多少．
<gadget id="calculator">99_999 * 77_778</gadget>
<output>7_777_722_222</output>

<gadget id="calculator">33_333 * 66_666</gadget>
<output>2_222_177_778</output>

<gadget id="calculator">7_777_722_222 + 2_222_177_778</gadget>
<output>9_999_900_000</output>

<result>9_999_900_000</result>