9999*7778+3333*6666.
9999*7778+3333*6666．
<gadget id="calculator">9_999 * 7_778</gadget>
<output>77_772_222</output>

<gadget id="calculator">3_333 * 6_666</gadget>
<output>22_217_778</output>

<gadget id="calculator">77_772_222 + 22_217_778</gadget>
<output>99_990_000</output>

<result>99_990_000</result>