210 can be decomposed into the product of four unequal prime numbers. Among the four prime numbers, take two numbers to form the smallest fraction A, and the other two numbers to form the fraction B. Then AB=what.
210可以分解成四个互不相等的质数的乘积，在这四个质数中取两个数组成最小的分数A，另外两个数组成分数B，则AB=多少．
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(2/7) * (3/5)</gadget>
<output>6/35 = around 0.171429</output>

<result>6/35 = around 0.171429</result>