[請益] 國小五年級 概數計算
最近發現小五數學康軒版得 "概數" 教法很奇特,答案跟計算機按出來也不一樣..
EX: 2.567 X 3.568 = ? (請取概數到小數點第二位)
康軒版解: 2.567 ----> 2.57
3.568 ----> 3.57
2.57 X 3.57 = 9.1794 A: 9.1794
可是若照以前的教法是: 2.567 X 3.568 = 9.159056 ≒ 9.16
想問板上資深的補教老師 , 到底為啥 概數 教法變樣了? 是以前錯了還是康軒版錯了?
謝謝!
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