Calculate with a simple method. 222*999+333*334.
用简便方法计算．222*999+333*334．
<gadget id="calculator">222 * 999</gadget>
<output>221_778</output>

<gadget id="calculator">333 * 334</gadget>
<output>111_222</output>

<gadget id="calculator">221_778 + 111_222</gadget>
<output>333_000</output>

<result>333_000</result>