作业帮三角函数.请解答一道应用题.Solving Exponential Equations1.The number of bacteria in a culture is doubling every 3.75 hours.How long will it take for the number of bacteria to increase from 30,000 to 7,680,000?Please show all steps and give
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三角函数.请解答一道应用题.Solving Exponential Equations1.The number of bacteria in a culture is doubling every 3.75 hours.How long will it take for the number of bacteria to increase from 30,000 to 7,680,000?Please show all steps and give
三角函数.请解答一道应用题.
Solving Exponential Equations
1.The number of bacteria in a culture is doubling every 3.75 hours.How long will it take for the number of bacteria to increase from 30,000 to 7,680,000?
Please show all steps and give details where needed!
Thanks!
三角函数.请解答一道应用题.Solving Exponential Equations1.The number of bacteria in a culture is doubling every 3.75 hours.How long will it take for the number of bacteria to increase from 30,000 to 7,680,000?Please show all steps and give
设：细菌经过x次翻倍后能从30000到7680000
30000 × 2^x = 7680000
2^x = 256
x=8
细菌每次翻倍需要3.75小时,则8次需要8×3.75=30小时.
假设30，000翻倍n次得到7,680,000
30000*2^n=7680000
得到n=8
所以时间t=8*3.75=30(小时)
设绳子长x米。 四分之一x减掉十分之一x=9 二十分之三x=9 二十分之三x除以二十分之三x=60 答：绳子长六十米。 设绳长x米 2×9 1/10x