問題詳情
22. 煙火自地面點燃發射，經過x秒後的高度為y公尺，x與y的關係式為y＝19.6x－4.9x2。則煙火經過a秒後可到達最大高度為b公尺，則a+b=？
(A) 17.
(B) 8
(C) 21.6
(D) 19.8
(A) 17.
(B) 8
(C) 21.6
(D) 19.8
參考答案
無參考答案
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