The least common multiple of two numbers A and B is 90; the least common multiple of two numbers B and C is 105; the least common multiple of two numbers A and C is 126, find the number of A.
甲、乙两数的最小公倍数是90；乙、丙两数的最小公倍数是105；甲、丙两数的最小公倍数是126，求甲数．
<gadget id="calculator">2 * 3 * 3</gadget>
<output>18</output>

<result>18</result>