抽气机每次抽出空气的60%.使剩下的空气少于原来的0.1%.则至少抽几次?
人气:305 ℃ 时间:2020-06-15 02:14:50
解答
设抽x次,原来抽气机里的空气体积为1
列出方程1·60%^x13.5
所以x(min)=14
60%^x 指 0.6的X次方
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