Define a new operation: Let a be an integer greater than 1, and stipulate a*b=ab+ab (example 3*5=3*5+3-5=13). Calculate (4*6)*(6*4)=how much.
定义新运算：设a为大于1的整数，规定a*b=ab+a-b(例3*5=3*5+3-5=13)．计算(4*6)*(6*4)=多少．
<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<gadget id="calculator">4 - 6</gadget>
<output>-2</output>

<gadget id="calculator">24 + (-2)</gadget>
<output>22</output>

<gadget id="calculator">6 * 4</gadget>
<output>24</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">24 + 2</gadget>
<output>26</output>

<gadget id="calculator">22 * 26</gadget>
<output>572</output>

<gadget id="calculator">22 - 26</gadget>
<output>-4</output>

<gadget id="calculator">572 + (-4)</gadget>
<output>568</output>

<result>568</result>