The numerator is 4, which is 5 less than the denominator. What is the fraction?
分子是4，比分母少5，这个分数是多少．
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>