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24. 在座標平面上,方程式y=2x2-9的圖形交x軸於A、A′ 兩點;方程式 的圖形交x軸於B、B′ 兩點;方程式 的圖形交x軸於C、C′ 兩點。比較 的長度,下列關係何者正確? (A) (B)
問題詳情
24. 在座標平面上,方程式y=2x2-9的圖形交x軸於A、A′ 兩點;方程式
的圖形交x軸於B、B′ 兩點;方程式
的圖形交x軸於C、C′ 兩點。比較
的長度,下列關係何者正確?
(A)
(B)
(C)
(D)
參考答案
答案:C
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5.如【圖一】,將某四邊形紙片ABCD的 方向摺過去(其中 ),使得A點落在 上,展開後出現摺線 ,如【圖二】。再將B點摺向D點,使得B、D兩點重疊,如【圖三】,展開後出現摺線 ,如【圖四】。根
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25. 座標平面上,若移動二次函數y=2 ( x-65 ) ( x-67 )+4的圖形,使其與x軸交於兩點,且此兩點的距離為2單位,則移動方式可為下列哪一種? (A) 向下移動1單位 (B) 向下移動
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