這道題目的意思是每過(guò)一個(gè)小時(shí),數(shù)量就翻倍.也即一個(gè)小時(shí)后,數(shù)量為29*2,兩個(gè)小時(shí)后,為29*2*2...以此類推,n個(gè)小時(shí)后為29*2的N次方.那么要達(dá)到1200個(gè),列出公式:29*(2的n次方)=1200
即n=㏒2(1200÷29),用計(jì)算器算出的n即為需要的時(shí)間.達(dá)到140個(gè)的時(shí)間只要將前邊式子的1200換為140即可.
A scientist places 29 cells in a petri dish.She knows the cells grow at an exponential rate,doubling in number every hou
A scientist places 29 cells in a petri dish.She knows the cells grow at an exponential rate,doubling in number every hour.
How long will it take (in hours) for there to be 1200 cells in the dish?
How long will it take to reach 140 cells?
How long will it take (in hours) for there to be 1200 cells in the dish?
How long will it take to reach 140 cells?
英語(yǔ)人氣：130 ℃時(shí)間：2020-02-04 12:38:46
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