[計量] 有一題Q作業不會
Four hours from now,the population of a colony of bactera
will reach 1.28×10^6.If the population of the colony doubles
every 4 hours,what was the population 12 hours ago?
(A)6.4×10^2 (B)8×10^4 (C)1.6×10^5 (D)3.2×10^5 (E)8×10^6
作業解答是(B) 可是我算不出B答案，麻煩大家幫忙，謝謝!
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