問題詳情
20.一顆棒球被擊出之後，離打擊點水平距離x公尺時，球離地面高度y公尺。若x與y的關係式為y＝－0.001x2＋0.07x＋1.8，試問球在擊出後幾公尺處落地？
(A) 70
(B)
(C)
(D) 120
(A) 70
(B)
(C)
(D) 120
參考答案
答案：C
難度：計算中-1
書單：沒有書單，新增
內容推薦
- 若y＝ax2＋bx＋c的圖形頂點為( 1 , 9 )，且圖形通過 A ( 6 , －13 ) 及B ( k , － 13 ) 兩點，下列敘述何者正確？ (A) 平行y軸 (B) a＞0(C)此
- 兩股長的和為20公分的直角三角形中，面積最大為多少平方公分？(A) 50 (B) (C) (D) 150
- 某二次函數的圖形經過平移後會與y＝3x2的圖形疊合，且其對稱軸為x＝－2，又通過點 (－1 , 9)，求此二次函數？(A) y＝－3( x－2)2＋(B) y＝3( x＋2 )2＋6(C)
- 若a是常數，函數y＝－a ( x－4)2＋1的圖形最有可能為下列何者？(A) (B) (C) (D)
- 三年A班有40人，男生體重的算術平均數是56公斤，女生體重的算術平均數是48公斤；若全班體重的算術平均數是53公斤，則男生有幾人？ (A) 18 (B) (C) (D) 30 。
- 求二次函數y＝－7x2＋42x－55的最大值或最小值？ (A) 最小值－7(B) 最大值(C)最小值－(D) 最大值8
- 附圖為二次函數y＝ax2＋bx＋c的圖形，則下列敘述何者正確？ (A)a＞0，c＞0，b2－4ac＜0 (B)a＞0，c＜0，b2－4ac＞0 (C)a＜0，c＞0，b2－4ac＞0 (D)
- 若二次函數y＝ax2＋bx＋c的圖形恰與x軸交於一點且開口向上，則下列敘述哪一個錯誤？ (A) 此二次函數圖形與y軸不一定有交點 (B) b2－4ac＝0 (C) c ≥ 0 (D)此二次函數
- 哪一個二次函數的圖形完全在x軸之下方？ (A) y＝－4x( x＋4 )2－11(B) y＝－( x－6 )2＋11 (C) y＝ ( x＋4 )2－ (D)y＝ 4( x－6 )2－11
- 二次函數y＝f (x)＝ax2＋bx＋c，圖形的開口向上且頂點為 ( 2 , －4 )。下列函數值哪一個最大？ (A) f (7) (B) f ( 0 ) (C) f (－3 ) (D) f
內容推薦
- 某商品的原定價為每件40元，每星期可以賣出150件。如果調漲價格1元，則每個星期就會少賣3件；如果調降價格1元，則每個星期就會多賣3件， 已知該商品每件的成本為20元。問經最適當調整後每星期全部
- 二次函數y＝21x2－36x＋3的圖形與下列哪一個方程式的圖形沒有交點？ (A)x＝500 (B)x＝－500(C)y＝500 (D)y＝－500
- 有21位遊客參加溪頭之旅，他們年齡的次數分配表如下。已知這群遊客年齡的中位數是33歲，則何者正確？ (A) a＝(B) a＝(C) b＝(D) b＝5
- 附圖為二次函數y＝( x＋1 )2＋5的圖形，若在第一象限有一點P( a , b )在此二次函數上，且與原點及Q(6 ,0) 所圍成的△OPQ面積為S，若S＝162，則a＋b＝？ (A)60
- 10液壓煞車之煞車主缸回油孔如果阻塞，會使煞車咬住。(A)O(B)X
- Danny saw a cockroach in front of him. He didn’t dare to go ________ .(A)kidding (B) chatting (C)
- Kobe Bryant, US basketball legend, died in a helicopter crash in California in early 2020, but hi
- ________I saw Tom’s strange smile, I knew there was something wrong.(A)As well as (B) As much as
- Last month, I visited my homeroom teacher in junior high and was surprised to know she ________fo
- Dad _____ run a marathon, but now he doesn’t because of his knee pain.(A)is used to (B) was used
- A: He’s never been late for work. B: ____________(A)So are his parents. (B) So have his parents.
- In Taiwan, poor people can ask _______ lawyers about the laws they need to know without paying.(A
- If we_____ the idea of saving energy, the Earth will become better.(A)put out (B) come true (C) p
- Neither the shoes nor the T-shirt ______ me.(A)belong to (B) belongs to (C) is belonged to (D) a
- A: I take exercise ____ in the morning ____ in the evening. B: I see. I also take exercise once
- My husband said he would help me clean the house, and he did. He_____ .(A)kept a diary (B) kept
- Rose: Hello, Ken? Where are you?Ken: I’m watching the NBA game at home. Rose: _____ You forgot o
- My sister bought two dresses, The pink one is more expensive than ________.(A) the others (B) ot
- As long as each of us _____ our part to clean the classroom, we_____ a more comfortable placefor
- Grandma: I can’t find my glasses. Would you please help me? Jane: _________________(A) Here it i
- 【題組】Your hands are dirty, but there is no soap and water. What can you do?(A) Use hand sanitizer
- 【題組】What should you NOT do if you feel sick?(A) Wear a mask when you got out.(B) Go to a party w
- 【題組】What was an obstacle(阻礙) that Amelia faced in her around the world flight?(A)She was a femal
- 【題組】What happened to Amelia Earhart?(A) She was found by U.S. ships. (B) She flew around the wor
- 【題組】Which is likely another example of a “hot zone”?(A) An island with very humid weather. (B) A