2的a次方=3 2的b次方等于6 2的c次方等于12 a.b.c 成啥子数列?是不是等比?
问题描述：
2的a次方=3 2的b次方等于6 2的c次方等于12 a.b.c 成啥子数列?是不是等比?
答
2^a = 3 ==> lg 2^a = lg 3 ==> a = lg3/lg2 = lg3/lg2 2^b = 6 ==> lg 2^b = lg 6 ==> b = lg6/lg2 = (lg2 + lg3) / lg2 = 1 + lg3/lg2 2^c = 12 ==> lg 2^c = lg 12 ==> c = lg12/lg2 = (lg4 + lg3) = 2+ lg3/lg2 ...