这道题目的意思是每过一个小时,数量就翻倍.也即一个小时后,数量为29*2,两个小时后,为29*2*2...以此类推,n个小时后为29*2的N次方.那么要达到1200个,列出公式:29*(2的n次方)=1200
即n=㏒2(1200÷29),用计算器算出的n即为需要的时间.达到140个的时间只要将前边式子的1200换为140即可.
A scientist places 29 cells in a petri dish.She knows the ce
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