Given that a and b are any rational numbers, we stipulate: a⊕b=a+b-1, a⊗b=ab-2, then 4⊗((6⊕8)⊕(3⊗5))=how much.
已知a，b是任意有理数，我们规定：a⊕b=a+b-1，a⊗b=ab-2，那么4⊗((6⊕8)⊕(3⊗5))=多少．
<gadget id="calculator">13 - 1</gadget>
<output>12</output>

<gadget id="calculator">13 + 12</gadget>
<output>25</output>

<gadget id="calculator">4 * 25</gadget>
<output>100</output>

<gadget id="calculator">100 - 2</gadget>
<output>98</output>

<result>98</result>