Use the four numbers 1, 4, 5, and 6 to form a formula through four arithmetic operations (brackets are allowed), so that the result of the formula is 24, then what is the formula.
用1，4，5，6四个数，通过四则运算(允许用括号)，组成一个算式，使算式的结果是24，那么这个算式是多少．
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">4 / (1/6)</gadget>
<output>24</output>

<result>24</result>