Choose two numbers from 2, 4, 7, and 8 to form a minimal proper fraction, and this fraction can be reduced to a finite decimal. What is the simplest true fraction?
从2、4、7、8中选两个数组成一个最简真分数，且这个分数能化成有限小数．这个最简真分数是多少．
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<result>7/8 = around 0.875</result>