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[數學]平方根與近似值

Oct 1st 2013, 12:35

A為x平方根定義：面積x的正方形邊長是+-a

近似值的定義……我可以用舉例的嗎？
例：根號5的近似值（四捨五入法取到小數第一位：

2的平方＜根號五的平方＜三的平方
2＜根號5＜3（要是連續的數）
繼續求
2.23的平方＜根號五＜2.24的平方
根號5約等於2.23約等於2.2

31的平方＜1000＜32的平方
31＜根號1000＜32
31平方=961
1000-961=39
剩39塊

有一些我不會解釋……

參考資料：我的小小腦袋瓜:-P

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