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8.等比級數 至前6項之和為 (A) (B) (C) (D)
問題詳情
8.等比級數
至前6項之和為
(A)
(B)
(C)
(D)
參考答案
答案:C
難度:
計算中
-1
書單:
沒有書單,新增
上一篇 :
7.設一等比數列,首項是27,公比為 ,則第7項為 (A) (B) (C) (D)
下一篇 :
9.已知一等比數列的第3項為20,第8項為640,則其公比等於 (A)1 (B)2 (C)3 (D)4。
資訊推薦
10.一無窮等比級數之第3項為 ,第6項為 ,則此無窮等比級數的和為 (A)1 (B) (C)2 (D)
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20. A: Is Denny’s girlfriend ______? B: I have no idea.(A) smart girl(B) a cute girl(C) cute and sma
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22. A: ______ is your name? B: My name is Stella.(A) How(B) How old(C) Who(D) What
23. A: Where ______ Adele ______? B: The UK.(A) does / from(B) is / from(C) do / come from(D) is /co
24. I’m Tim’s aunt. So Tim is my ______.(A) cousin(B) niece(C) son(D) nephew
25. A: How are you doing? B: ______. (Choose the wrong answer.)(A) So-so.(B) Very well.(C) I’m prett
26. My brother is an ______ student. He enjoys going to school.(A) one-year-old(B) eleven-years-old(
27. A: Have you heard of President Obama?B: Sure. He’s ______father.(A) Malia and Sasha’s(B) Malia’s
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【題組】32. A: Brian and Cathy probably like ______.(A) the same music(B) the same sports(C) to dance(D)
【題組】33. Which of the following is true?(A) Cathy doesn’t know about the school’s library.(B) Cathy a
【題組】35. A: Where do the Watanabes live?(A) London, England(B) Tokyo, Japan(C) Paris, France(D) Seoul
【題組】36. A: Which of the children in the reading is the youngest?(A) Greg(B) Alice(C) Mika(D) Yuki
【題組】38. A: Which of the following is true?(A) Pigs like to be dirty.(B) People can teach pigs things
【題組】39. A: What kind of pigs do people raise in their houses?(A) The very big kind.(B) The small kin
【題組】40. The article does NOT discuss ______. discuss討論(A) pigs as pets(B) pigs on farms and in the
2.設A(3,2) 、B(-1,5) ,則 = (A)(4,-3) (B)(-4,3) (C)(-4.-3) (D)(4,3)
3.已知A(3,2) 、B(-1,4) 、C(5,8) ,若ABCD 為平行四邊形,則D點坐標為 (A)(9,6) (B)(-9,-6) (C)(-3,-2) (D)(1,10)
4.設二向量 ,則x+y=? (A)0 (B)-1 (C)1 (D)2。