數學酒精與水混合問題 - 酒精
By Annie
at 2009-03-04T00:00
at 2009-03-04T00:00
Table of Contents
某校為預防SARS病毒,利用濃度95%的藥用酒精,加純水調配成濃度75%的酒精。其調配時所用的藥用酒精式a公升、純水是b
公升,則 a : b=______
公升,則 a : b=______
Tags:
酒精
All Comments
By Lauren
at 2009-03-06T16:20
at 2009-03-06T16:20
1.M=0.95*a=0.75*(a+b)
(a+b)/a=0.95/0.75
1+(b/a)=95/75=1+20/75
b/a=20/75
a:b=75:20=15:4
其實上一位大大已經做出來了,在此補上做法。
By Hamiltion
at 2009-03-06T04:29
at 2009-03-06T04:29
=4:15
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