The baby mouse bought a piece of cake weighing (8/9) kilograms, the mother mouse ate (2/9) kilograms, the father mouse ate (2/9) kilograms more than the mother mouse, and the rest was eaten by the mouse baby ． How many kilograms of cakes did the baby mouse eat?
鼠宝宝买回一块重(8/9)千克的饼，鼠妈妈吃了(2/9)千克，鼠爸爸比鼠妈妈多吃了(2/9)千克，剩下的被鼠宝宝吃光了．鼠宝宝吃了多少千克饼？
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(2/9) + (2/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(8/9) - (4/9) - (2/9)</gadget>
<output>2/9 = around 0.222222</output>

<result>2/9 = around 0.222222</result>