Convert (5/8) and (3/14) into fractions with the same fraction unit, and it is more appropriate to choose a common denominator.
把(5/8)和(3/14)化成分数单位一样的分数，公分母选用多少比较合适．
<gadget id="calculator">2 * 2 * 2 * 7</gadget>
<output>56</output>

<result>56</result>