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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
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六年級數學 百分率的問題 急!
Feb 3rd 2014, 06:34

1. 94.5 ÷ (1.15 - 25%) x 3又七分之一 =?

2. 270 x (2又4分之5 - 0.05) x 60% =?

3. (1又4分之1 + 75%) x (68% - 25分之3) =?

4. □ x (1 - 75%) =15，□=?

5. 5000公斤且濃度4%的海水，可提煉出純鹽多少公斤？(麻煩打出算式)

6. 濃度3%的鹽水200公克，加入水100公克後，濃度變成多少%? (麻煩打出算式)

拜託求解了 因為有點急 所以給20點 謝謝您!!!

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