Let a and b be natural numbers, define a*b as follows: if a≥b, define a*b=ab, if a<b, then define a*b=ba. Calculation: (3*4)*9=how much.
设a、b为自然数，定义a※b如下：如果a≥b，定义a※b=a-b，如果a＜b，则定义a※b=b-a．计算：(3※4)※9=多少．
<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">9 - 1</gadget>
<output>8</output>

<result>8</result>