Given the equation ab+a=2006, ab+b=2005, if a and b represent an integer, what is the value of ab
已知等式ab+a=2006，ab+b=2005，若a和b分别代表一个整数，则a-b的值为多少
<gadget id="calculator">2_006 - 2_005</gadget>
<output>1</output>

<result>1</result>