a=n*3*4, b=3*4*m, (m, n is a non-zero natural number), the greatest common factor of a and b is 12, then what is the least common multiple of a and b.
a=n*3*4，b=3*4*m，(m，n为非零自然数)，a，b的最大公因数是12，那么a，b的最小公倍数是多少．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<result>12</result>