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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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邏輯數學問題~跪求解說!!
Oct 1st 2014, 06:10

1.正方體邊長君1/4倍,則表面積增加幾倍?解答:9/16
2.rs=4,(r-s)2=2,則r2+s2=?解答:10
3.有一火車速度4m/sec,欲通過一鐵橋,橋長16公尺,火車全長36公尺,則火車完全通過鐵橋需要多少時間?解答:13
4.有太郎,次郎,三郎三兄弟,太郎與次郎,次郎與三郎的年齡差距都是一樣的;太郎是三郎的兩倍還少七歲,三郎是次郎的一半還多五歲;請問次郎的年齡是幾歲?解答:16

麻煩各位大大解說!!急!!重要!!

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