3.
400/420=x-0.8/x
400x=420x-336
20x=336
x=16.8
+ / -檢視主題
由 屎坑中的妖物 於 星期二 五月 16, 2006 9:47 pm
[智力測驗],,來自數學白痴的求救~~~~~~~~~~~~
由 伊莉沙白 於 星期二 五月 16, 2006 7:24 pm
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