Let a and b represent two numbers respectively. If aΣb represents ((ab)/3), according to this rule, what is the result of 6Σ(8Σ5).
设a，b分别表示两个数，如果aΣb表示((a-b)/3)，照这样的规则，6Σ(8Σ5)的结果是多少．
<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<result>5/3 = around 1.666667</result>