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20. 直角三角形 A、B、C 中,c 為斜邊長,a、b 為兩股長,a、b、c 均為正整數,則 下列敘述何者正確? (A) a2是(c – b)的倍數 (B) (a + b)是 c 的倍數 (C)
問題詳情
20. 直角三角形 A、B、C 中,c 為斜邊長,a、b 為兩股長,a、b、c 均為正整數,則 下列敘述何者正確?
(A) a2是(c – b)的倍數
(B) (a + b)是 c 的倍數
(C) c2是(a + b)的倍數
(D) (a + c)是 b 的倍數
參考答案
答案:A
統計:A:60,B:8,C:12,D:19,E:0
難度:簡單
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21. 小明向上投擲一石頭,若時間為 t 秒時,石頭離地面的高度為 S 呎,這兩者滿足關係式為 S= 24t – 3t2,則經過幾秒鐘後,石頭會落到地面? (A) 4 (B) 6 (C) 8 (D)
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