[請益] 一元一次不等式教法
已知a、b、c三數 |a|>b>|c|,請問下列敘述何者正確?
1.c<0 2.b-c>0 3.a-b > 0 4. a-c >0
教法1:帶數字令a=±3、b=2、c=±1
教法2:用數線表示(抱歉,不太會畫,就是不等式合併的圖解)
教法3:用a>0 |a|=a、a<0 |a|=-a,先判斷正負,再解釋負得多或少
這三種哪種比較可以提升學生正確的觀念及程度??
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※ 編輯: kksteak 來自: 61.224.206.32 (06/19 00:16)
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